Add option to disable the stitch plan cache (#2655)

Setting the cache size to 0 bypasses the cache completely.
This is necessary during development to ensure newly-changed code actually gets run.

Also fixes the error pane in the params gui.


* make params warning pane large enough to see contents
* rename sizers in preferences dialog descriptive names
* add shapely version bound
* add option to disable stitch plan cache
* remove out-of-date wxg file
* make a cache size of 0 disable the cache

6 files changed, 50 insertions, 344 deletions

diff --git a/lib/elements/element.py b/lib/elements/element.py
index c9d7c377..ae0ff5c6 100644
--- a/lib/elements/element.py
+++ b/lib/elements/element.py
@@ -22,7 +22,7 @@ from ..svg import (PIXELS_PER_MM, apply_transforms, convert_length,
                    get_node_transform)
 from ..svg.tags import INKSCAPE_LABEL, INKSTITCH_ATTRIBS
 from ..utils import Point, cache
-from ..utils.cache import CacheKeyGenerator, get_stitch_plan_cache
+from ..utils.cache import get_stitch_plan_cache, is_cache_disabled, CacheKeyGenerator
 
 
 class Param(object):
@@ -496,6 +496,9 @@ class EmbroideryElement(object):
 
     @debug.time
     def _load_cached_stitch_groups(self, previous_stitch):
+        if is_cache_disabled():
+            return None
+
         if not self.uses_previous_stitch():
             # we don't care about the previous stitch
             previous_stitch = None
@@ -519,6 +522,9 @@ class EmbroideryElement(object):
 
     @debug.time
     def _save_cached_stitch_groups(self, stitch_groups, previous_stitch):
+        if is_cache_disabled():
+            return
+
         stitch_plan_cache = get_stitch_plan_cache()
         cache_key = self.get_cache_key(previous_stitch)
         if cache_key not in stitch_plan_cache:
diff --git a/lib/gui/preferences.py b/lib/gui/preferences.py
index a8a2dc7a..adb84248 100644
--- a/lib/gui/preferences.py
+++ b/lib/gui/preferences.py
@@ -30,17 +30,17 @@ class PreferencesFrame(wx.Frame):
         self.this_svg_page = wx.Panel(self.notebook, wx.ID_ANY)
         self.notebook.AddPage(self.this_svg_page, _("This SVG"))
 
-        sizer_1 = wx.BoxSizer(wx.VERTICAL)
+        this_svg_margin = wx.BoxSizer(wx.VERTICAL)
 
         # add space above and below to center sizer_2 vertically
-        sizer_1.Add((0, 20), 1, wx.EXPAND, 0)
+        this_svg_margin.Add((0, 20), 1, wx.EXPAND, 0)
 
-        sizer_2 = wx.FlexGridSizer(2, 4, 15, 10)
-        sizer_1.Add(sizer_2, 0, wx.EXPAND | wx.LEFT | wx.RIGHT, 20)
+        this_svg_grid = wx.FlexGridSizer(2, 4, 15, 10)
+        this_svg_margin.Add(this_svg_grid, 0, wx.EXPAND | wx.LEFT | wx.RIGHT, 20)
 
         label_1 = wx.StaticText(self.this_svg_page, wx.ID_ANY, _("Minimum jump stitch length"), style=wx.ALIGN_LEFT)
         label_1.SetToolTip(_("Jump stitches smaller than this will be treated as normal stitches."))
-        sizer_2.Add(label_1, 1, wx.ALIGN_CENTER_VERTICAL | wx.RIGHT, 15)
+        this_svg_grid.Add(label_1, 1, wx.ALIGN_CENTER_VERTICAL | wx.RIGHT, 15)
 
         self.minimum_jump_stitch_length = wx.SpinCtrlDouble(
             self.this_svg_page, wx.ID_ANY, inc=0.1,
@@ -48,16 +48,16 @@ class PreferencesFrame(wx.Frame):
             style=wx.ALIGN_RIGHT | wx.SP_ARROW_KEYS
         )
         self.minimum_jump_stitch_length.SetDigits(1)
-        sizer_2.Add(self.minimum_jump_stitch_length, 0, wx.ALIGN_CENTER_VERTICAL, 0)
+        this_svg_grid.Add(self.minimum_jump_stitch_length, 0, wx.ALIGN_CENTER_VERTICAL, 0)
 
         label_2 = wx.StaticText(self.this_svg_page, wx.ID_ANY, _("mm"))
-        sizer_2.Add(label_2, 0, wx.ALIGN_CENTER_VERTICAL | wx.RIGHT, 15)
+        this_svg_grid.Add(label_2, 0, wx.ALIGN_CENTER_VERTICAL | wx.RIGHT, 15)
 
         self.button_1 = wx.Button(self.this_svg_page, wx.ID_ANY, _("Set As Default"))
-        sizer_2.Add(self.button_1, 0, wx.ALIGN_CENTER_VERTICAL, 0)
+        this_svg_grid.Add(self.button_1, 0, wx.ALIGN_CENTER_VERTICAL, 0)
 
         label_3 = wx.StaticText(self.this_svg_page, wx.ID_ANY, _("Minimum stitch length"))
-        sizer_2.Add(label_3, 0, 0, 0)
+        this_svg_grid.Add(label_3, 0, 0, 0)
 
         self.minimum_stitch_length = wx.SpinCtrlDouble(
             self.this_svg_page, wx.ID_ANY, inc=0.1,
@@ -65,30 +65,30 @@ class PreferencesFrame(wx.Frame):
             style=wx.ALIGN_RIGHT | wx.SP_ARROW_KEYS
         )
         self.minimum_stitch_length.SetDigits(1)
-        sizer_2.Add(self.minimum_stitch_length, 0, wx.ALIGN_CENTER_VERTICAL, 0)
+        this_svg_grid.Add(self.minimum_stitch_length, 0, wx.ALIGN_CENTER_VERTICAL, 0)
 
         label_4 = wx.StaticText(self.this_svg_page, wx.ID_ANY, _("mm"))
-        sizer_2.Add(label_4, 0, wx.ALIGN_CENTER_VERTICAL, 0)
+        this_svg_grid.Add(label_4, 0, wx.ALIGN_CENTER_VERTICAL, 0)
 
         self.button_2 = wx.Button(self.this_svg_page, wx.ID_ANY, _("Set As Default"))
-        sizer_2.Add(self.button_2, 0, wx.ALIGN_CENTER_VERTICAL, 0)
+        this_svg_grid.Add(self.button_2, 0, wx.ALIGN_CENTER_VERTICAL, 0)
 
-        sizer_1.Add((0, 20), 1, wx.EXPAND, 0)
+        this_svg_margin.Add((0, 20), 1, wx.EXPAND, 0)
 
         self.global_page = wx.Panel(self.notebook, wx.ID_ANY)
         self.notebook.AddPage(self.global_page, _("Global"))
 
-        sizer_3 = wx.BoxSizer(wx.VERTICAL)
+        global_margin = wx.BoxSizer(wx.VERTICAL)
 
         # add space above and below to center sizer_4 vertically
-        sizer_3.Add((0, 20), 1, wx.EXPAND, 0)
+        global_margin.Add((0, 20), 1, wx.EXPAND, 0)
 
-        sizer_4 = wx.FlexGridSizer(3, 4, 15, 10)
-        sizer_3.Add(sizer_4, 0, wx.EXPAND | wx.LEFT | wx.RIGHT, 20)
+        global_grid_sizer = wx.FlexGridSizer(3, 4, 15, 10)
+        global_margin.Add(global_grid_sizer, 0, wx.EXPAND | wx.LEFT | wx.RIGHT, 20)
 
         label_5 = wx.StaticText(self.global_page, wx.ID_ANY, _("Default minimum jump stitch length"), style=wx.ALIGN_LEFT)
         label_5.SetToolTip(_("Jump stitches smaller than this will be treated as normal stitches."))
-        sizer_4.Add(label_5, 1, wx.ALIGN_CENTER_VERTICAL | wx.RIGHT, 15)
+        global_grid_sizer.Add(label_5, 1, wx.ALIGN_CENTER_VERTICAL | wx.RIGHT, 15)
 
         self.default_minimum_jump_stitch_length = wx.SpinCtrlDouble(
             self.global_page, wx.ID_ANY, inc=0.1,
@@ -96,15 +96,15 @@ class PreferencesFrame(wx.Frame):
             style=wx.ALIGN_RIGHT | wx.SP_ARROW_KEYS
         )
         self.default_minimum_jump_stitch_length.SetDigits(1)
-        sizer_4.Add(self.default_minimum_jump_stitch_length, 0, wx.ALIGN_CENTER_VERTICAL, 0)
+        global_grid_sizer.Add(self.default_minimum_jump_stitch_length, 0, wx.ALIGN_CENTER_VERTICAL, 0)
 
         label_6 = wx.StaticText(self.global_page, wx.ID_ANY, _("mm"))
-        sizer_4.Add(label_6, 0, wx.ALIGN_CENTER_VERTICAL | wx.RIGHT, 15)
+        global_grid_sizer.Add(label_6, 0, wx.ALIGN_CENTER_VERTICAL | wx.RIGHT, 15)
 
-        sizer_4.Add((0, 0), 0, 0, 0)
+        global_grid_sizer.Add((0, 0), 0, 0, 0)
 
         label_7 = wx.StaticText(self.global_page, wx.ID_ANY, _("Minimum stitch length"))
-        sizer_4.Add(label_7, 0, wx.ALIGN_CENTER_VERTICAL, 0)
+        global_grid_sizer.Add(label_7, 0, wx.ALIGN_CENTER_VERTICAL, 0)
 
         self.default_minimum_stitch_length = wx.SpinCtrlDouble(
             self.global_page, wx.ID_ANY, inc=0.1,
@@ -112,16 +112,15 @@ class PreferencesFrame(wx.Frame):
             style=wx.ALIGN_RIGHT | wx.SP_ARROW_KEYS
         )
         self.default_minimum_stitch_length.SetDigits(1)
-        sizer_4.Add(self.default_minimum_stitch_length, 0, wx.ALIGN_CENTER_VERTICAL, 0)
+        global_grid_sizer.Add(self.default_minimum_stitch_length, 0, wx.ALIGN_CENTER_VERTICAL, 0)
 
         label_8 = wx.StaticText(self.global_page, wx.ID_ANY, _("mm"))
-        sizer_4.Add(label_8, 0, wx.ALIGN_CENTER_VERTICAL, 0)
+        global_grid_sizer.Add(label_8, 0, wx.ALIGN_CENTER_VERTICAL, 0)
 
-        sizer_4.Add((0, 20), 0, 0, 0)
+        global_grid_sizer.Add((0, 20), 0, 0, 0)
 
-        label_9 = wx.StaticText(self.global_page, wx.ID_ANY, _("Stitch plan cache size"), style=wx.ALIGN_LEFT)
-        label_9.SetToolTip(_("Jump stitches smaller than this will be treated as normal stitches."))
-        sizer_4.Add(label_9, 1, wx.ALIGN_CENTER_VERTICAL, 0)
+        label_9 = wx.StaticText(self.global_page, wx.ID_ANY, _("Stitch plan cache size (0 to disable cache)"), style=wx.ALIGN_LEFT)
+        global_grid_sizer.Add(label_9, 1, wx.ALIGN_CENTER_VERTICAL, 0)
 
         self.stitch_plan_cache_size = wx.SpinCtrl(
             self.global_page, wx.ID_ANY,
@@ -129,15 +128,15 @@ class PreferencesFrame(wx.Frame):
             style=wx.ALIGN_RIGHT | wx.SP_ARROW_KEYS
         )
         self.stitch_plan_cache_size.SetIncrement(10)
-        sizer_4.Add(self.stitch_plan_cache_size, 0, wx.ALIGN_CENTER_VERTICAL | wx.ALIGN_RIGHT, 0)
+        global_grid_sizer.Add(self.stitch_plan_cache_size, 0, wx.ALIGN_CENTER_VERTICAL | wx.ALIGN_RIGHT, 0)
 
         label_10 = wx.StaticText(self.global_page, wx.ID_ANY, _("MB"))
-        sizer_4.Add(label_10, 0, wx.ALIGN_CENTER_VERTICAL, 0)
+        global_grid_sizer.Add(label_10, 0, wx.ALIGN_CENTER_VERTICAL, 0)
 
         self.clear_cache_button = wx.Button(self.global_page, wx.ID_ANY, _("Clear Stitch Plan Cache"))
-        sizer_4.Add(self.clear_cache_button, 0, wx.ALIGN_CENTER_VERTICAL, 0)
+        global_grid_sizer.Add(self.clear_cache_button, 0, wx.ALIGN_CENTER_VERTICAL, 0)
 
-        sizer_3.Add((0, 0), 1, wx.EXPAND, 0)
+        global_margin.Add((0, 0), 1, wx.EXPAND, 0)
 
         button_sizer = wx.BoxSizer(wx.HORIZONTAL)
         main_sizer.Add(button_sizer, 0, wx.BOTTOM | wx.EXPAND | wx.LEFT | wx.RIGHT, 10)
@@ -150,13 +149,13 @@ class PreferencesFrame(wx.Frame):
         self.ok_button = wx.Button(self.panel_1, wx.ID_OK, "")
         button_sizer.Add(self.ok_button, 0, 0, 0)
 
-        sizer_4.AddGrowableCol(0)
+        global_grid_sizer.AddGrowableCol(0)
 
-        self.global_page.SetSizer(sizer_3)
+        self.global_page.SetSizer(global_margin)
 
-        sizer_2.AddGrowableCol(0)
+        this_svg_grid.AddGrowableCol(0)
 
-        self.this_svg_page.SetSizer(sizer_1)
+        self.this_svg_page.SetSizer(this_svg_margin)
 
         self.panel_1.SetSizer(main_sizer)
 
@@ -193,6 +192,8 @@ class PreferencesFrame(wx.Frame):
         stitch_plan_cache = get_stitch_plan_cache()
         stitch_plan_cache.size_limit = int(global_settings['cache_size'] * 1024 * 1024)
         stitch_plan_cache.cull()
+        if not global_settings['cache_size']:
+            stitch_plan_cache.clear(retry=True)
 
     def cancel_button_clicked(self, event):
         self.Destroy()
diff --git a/lib/gui/preferences.wxg b/lib/gui/preferences.wxg
deleted file mode 100644
index 328ccce3..00000000
--- a/lib/gui/preferences.wxg
+++ /dev/null
@@ -1,305 +0,0 @@
-<?xml version="1.0"?>
-<!-- generated by wxGlade 1.0.5 on Tue Aug 15 00:11:05 2023 -->
-
-<application class="PreferencesApp" encoding="UTF-8" for_version="3.0" header_extension=".h" indent_amount="4" indent_symbol="space" is_template="0" language="python" mark_blocks="1" name="app" option="0" overwrite="1" path="/home/lex/repos/inkstitch/lib/gui/preferences.py" source_extension=".cpp" top_window="frame" use_gettext="1" use_new_namespace="1">
-    <object class="PreferencesFrame" name="frame" base="EditFrame">
-        <extracode_post>self.SetSizeHints(main_sizer.CalcMin())</extracode_post>
-        <title>Preferences</title>
-        <style>wxDEFAULT_FRAME_STYLE</style>
-        <object class="wxPanel" name="panel_1" base="EditPanel">
-            <object class="wxBoxSizer" name="main_sizer" base="EditBoxSizer">
-                <orient>wxVERTICAL</orient>
-                <object class="sizeritem">
-                    <option>1</option>
-                    <border>10</border>
-                    <flag>wxALL|wxEXPAND</flag>
-                    <object class="wxNotebook" name="notebook" base="EditNotebook">
-                        <style>wxNB_TOP</style>
-                        <tabs>
-                            <tab window="this_svg_page">This SVG</tab>
-                            <tab window="global_page">Global</tab>
-                        </tabs>
-                        <object class="wxPanel" name="this_svg_page" base="EditPanel">
-                            <style>wxTAB_TRAVERSAL</style>
-                            <object class="wxBoxSizer" name="sizer_1" base="EditBoxSizer">
-                                <orient>wxVERTICAL</orient>
-                                <object class="sizeritem">
-                                    <option>1</option>
-                                    <border>0</border>
-                                    <flag>wxEXPAND</flag>
-                                    <object class="spacer" name="spacer" base="EditSpacer">
-                                        <extracode_pre># add space above and below to center sizer_2 vertically</extracode_pre>
-                                        <width>0</width>
-                                        <height>0</height>
-                                    </object>
-                                </object>
-                                <object class="sizeritem">
-                                    <option>0</option>
-                                    <border>20</border>
-                                    <flag>wxLEFT|wxRIGHT|wxEXPAND</flag>
-                                    <object class="wxFlexGridSizer" name="sizer_2" base="EditFlexGridSizer">
-                                        <rows>2</rows>
-                                        <cols>4</cols>
-                                        <vgap>15</vgap>
-                                        <hgap>10</hgap>
-                                        <growable_cols>0</growable_cols>
-                                        <object class="sizeritem">
-                                            <option>1</option>
-                                            <border>15</border>
-                                            <flag>wxRIGHT|wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxStaticText" name="label_1" base="EditStaticText">
-                                                <tooltip>Jump stitches smaller than this will be treated as normal stitches.</tooltip>
-                                                <style>wxALIGN_LEFT</style>
-                                                <label>Minimum jump stitch length</label>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxSpinCtrlDouble" name="minimum_jump_stitch_length" base="EditSpinCtrlDouble">
-                                                <style>wxSP_ARROW_KEYS|wxALIGN_RIGHT</style>
-                                                <value>0.0</value>
-                                                <digits>1</digits>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>15</border>
-                                            <flag>wxRIGHT|wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxStaticText" name="label_2" base="EditStaticText">
-                                                <label>mm</label>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxButton" name="button_1" base="EditButton">
-                                                <events>
-                                                    <handler event="EVT_BUTTON">set_as_default_minimum_jump_stitch_length</handler>
-                                                </events>
-                                                <label>Set As Default</label>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <object class="wxStaticText" name="label_3" base="EditStaticText">
-                                                <label>Minimum stitch length</label>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxSpinCtrlDouble" name="minimum_stitch_length" base="EditSpinCtrlDouble">
-                                                <style>wxSP_ARROW_KEYS|wxALIGN_RIGHT</style>
-                                                <range>0.0, 100.0</range>
-                                                <value>0.0</value>
-                                                <digits>1</digits>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxStaticText" name="label_4" base="EditStaticText">
-                                                <label>mm</label>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxButton" name="button_2" base="EditButton">
-                                                <events>
-                                                    <handler event="EVT_BUTTON">set_as_default_minimum_stitch_length</handler>
-                                                </events>
-                                                <label>Set As Default</label>
-                                            </object>
-                                        </object>
-                                    </object>
-                                </object>
-                                <object class="sizeritem">
-                                    <option>1</option>
-                                    <border>0</border>
-                                    <flag>wxEXPAND</flag>
-                                    <object class="spacer" name="spacer" base="EditSpacer">
-                                        <width>0</width>
-                                        <height>0</height>
-                                    </object>
-                                </object>
-                            </object>
-                        </object>
-                        <object class="wxPanel" name="global_page" base="EditPanel">
-                            <style>wxTAB_TRAVERSAL</style>
-                            <object class="wxBoxSizer" name="sizer_3" base="EditBoxSizer">
-                                <orient>wxVERTICAL</orient>
-                                <object class="sizeritem">
-                                    <option>1</option>
-                                    <border>0</border>
-                                    <flag>wxEXPAND</flag>
-                                    <object class="spacer" name="spacer" base="EditSpacer">
-                                        <extracode_pre># add space above and below to center sizer_4 vertically</extracode_pre>
-                                        <width>0</width>
-                                        <height>0</height>
-                                    </object>
-                                </object>
-                                <object class="sizeritem">
-                                    <option>0</option>
-                                    <border>20</border>
-                                    <flag>wxLEFT|wxRIGHT|wxEXPAND</flag>
-                                    <object class="wxFlexGridSizer" name="sizer_4" base="EditFlexGridSizer">
-                                        <rows>3</rows>
-                                        <cols>4</cols>
-                                        <vgap>15</vgap>
-                                        <hgap>10</hgap>
-                                        <growable_cols>0</growable_cols>
-                                        <object class="sizeritem">
-                                            <option>1</option>
-                                            <border>15</border>
-                                            <flag>wxRIGHT|wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxStaticText" name="label_5" base="EditStaticText">
-                                                <tooltip>Jump stitches smaller than this will be treated as normal stitches.</tooltip>
-                                                <style>wxALIGN_LEFT</style>
-                                                <label>Default minimum jump stitch length</label>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxSpinCtrlDouble" name="default_minimum_jump_stitch_length_copy" base="EditSpinCtrlDouble">
-                                                <style>wxSP_ARROW_KEYS|wxALIGN_RIGHT</style>
-                                                <range>0.0, 100.0</range>
-                                                <value>0.0</value>
-                                                <digits>1</digits>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>15</border>
-                                            <flag>wxRIGHT|wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxStaticText" name="label_6" base="EditStaticText">
-                                                <label>mm</label>
-                                            </object>
-                                        </object>
-                                        <object class="sizerslot" />
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxStaticText" name="label_7" base="EditStaticText">
-                                                <label>Minimum stitch length</label>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxSpinCtrlDouble" name="default_minimum_stitch_length" base="EditSpinCtrlDouble">
-                                                <style>wxSP_ARROW_KEYS|wxALIGN_RIGHT</style>
-                                                <range>0.0, 100.0</range>
-                                                <value>0.0</value>
-                                                <digits>1</digits>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxStaticText" name="label_8" base="EditStaticText">
-                                                <label>mm</label>
-                                            </object>
-                                        </object>
-                                        <object class="sizerslot" />
-                                        <object class="sizeritem">
-                                            <option>1</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxStaticText" name="label_9" base="EditStaticText">
-                                                <tooltip>Jump stitches smaller than this will be treated as normal stitches.</tooltip>
-                                                <style>wxALIGN_LEFT</style>
-                                                <label>Stitch plan cache size</label>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxSpinCtrlDouble" name="stitch_plan_cache_size" base="EditSpinCtrlDouble">
-                                                <style>wxSP_ARROW_KEYS|wxALIGN_RIGHT</style>
-                                                <range>0.0, 100.0</range>
-                                                <value>0.0</value>
-                                                <digits>1</digits>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxStaticText" name="label_10" base="EditStaticText">
-                                                <label>MB</label>
-                                            </object>
-                                        </object>
-                                        <object class="sizeritem">
-                                            <option>0</option>
-                                            <border>0</border>
-                                            <flag>wxALIGN_CENTER_VERTICAL</flag>
-                                            <object class="wxButton" name="button_3" base="EditButton">
-                                                <label>Clear Stitch Plan Cache</label>
-                                            </object>
-                                        </object>
-                                    </object>
-                                </object>
-                                <object class="sizeritem">
-                                    <option>1</option>
-                                    <border>0</border>
-                                    <flag>wxEXPAND</flag>
-                                    <object class="spacer" name="spacer" base="EditSpacer">
-                                        <width>0</width>
-                                        <height>0</height>
-                                    </object>
-                                </object>
-                            </object>
-                        </object>
-                    </object>
-                </object>
-                <object class="sizeritem">
-                    <option>0</option>
-                    <border>10</border>
-                    <flag>wxLEFT|wxRIGHT|wxBOTTOM|wxEXPAND</flag>
-                    <object class="wxBoxSizer" name="button_sizer" base="EditBoxSizer">
-                        <orient>wxHORIZONTAL</orient>
-                        <object class="sizeritem">
-                            <option>1</option>
-                            <border>0</border>
-                            <object class="spacer" name="spacer" base="EditSpacer">
-                                <width>0</width>
-                                <height>0</height>
-                            </object>
-                        </object>
-                        <object class="sizeritem">
-                            <option>0</option>
-                            <border>10</border>
-                            <flag>wxRIGHT</flag>
-                            <object class="wxButton" name="button_4" base="EditButton">
-                                <label>button_4</label>
-                                <stockitem>CANCEL</stockitem>
-                            </object>
-                        </object>
-                        <object class="sizeritem">
-                            <option>0</option>
-                            <border>0</border>
-                            <object class="wxButton" name="button_5" base="EditButton">
-                                <label>button_5</label>
-                                <stockitem>OK</stockitem>
-                            </object>
-                        </object>
-                    </object>
-                </object>
-            </object>
-        </object>
-    </object>
-</application>
diff --git a/lib/gui/warnings.py b/lib/gui/warnings.py
index eda1ca2e..c8359fc9 100644
--- a/lib/gui/warnings.py
+++ b/lib/gui/warnings.py
@@ -23,7 +23,7 @@ class WarningPanel(wx.Panel):
         self.main_sizer.Add(self.warning, 1, wx.LEFT | wx.BOTTOM | wx.EXPAND, 10)
 
         tc_style = wx.TE_MULTILINE | wx.TE_READONLY | wx.VSCROLL | wx.TE_RICH2
-        self.warning_text = wx.TextCtrl(self, size=(300, 100), style=tc_style)
+        self.warning_text = wx.TextCtrl(self, size=(300, 300), style=tc_style)
         font = self.warning_text.GetFont()
         font.SetFamily(wx.FONTFAMILY_TELETYPE)
         self.warning_text.SetFont(font)
diff --git a/lib/utils/cache.py b/lib/utils/cache.py
index 1ede8ce1..543aaf15 100644
--- a/lib/utils/cache.py
+++ b/lib/utils/cache.py
@@ -39,6 +39,10 @@ def get_stitch_plan_cache():
     return __stitch_plan_cache
 
 
+def is_cache_disabled():
+    return not global_settings['cache_size']
+
+
 class CacheKeyGenerator(object):
     """Generate cache keys given arbitrary data.
 
diff --git a/lib/utils/settings.py b/lib/utils/settings.py
index 51cfcdb8..44310537 100644
--- a/lib/utils/settings.py
+++ b/lib/utils/settings.py
@@ -13,7 +13,7 @@ DEFAULT_METADATA = {
 
 DEFAULT_SETTINGS = {
     "cache_size": 100,
-    "pop_out_simulator": False
+    "pop_out_simulator": False,
 }