wx.lib.editor.Editor gets stuck in a loop generating "drawing failure for widget" messages

[reticulatus]

Operating system: Linux Mint 22
wxPython version & source: wxPython 4.2.2 gtk3 (phoenix) wxWidgets 3.2.6 from pypi
Python version & source: 3.12.3 from distro

It also occurs with wxPython 4.2.1 gtk3 (phoenix) wxWidgets 3.2.2.1 + Python 3.10.12 + Linux Mint 21.3

Description of the problem:

In the wxPython demo, the Editor control never fully appears. Continuous warning messages are output to the command line.

As a side effect, entries in the demo's tree control for other recently used examples turn invisible on a grey background.

See this animated gif (click the play button, if necessary):

Code Example (click to expand)

This is the example from the demo, modified to run stand-alone:

import wx
import wx.lib.editor as editor


class TestFrame(wx.Frame):
    def __init__(self, parent):
        wx.Frame.__init__(self, parent)

        win = wx.Panel(self, -1)
        ed = editor.Editor(win, -1, style=wx.SUNKEN_BORDER)
        box = wx.BoxSizer(wx.VERTICAL)
        box.Add(ed, 1, wx.ALL|wx.GROW, 1)
        win.SetSizer(box)
        win.SetAutoLayout(True)

        ed.SetText(["",
                    "This is a simple text editor, the class name is",
                    "Editor.  Type a few lines and try it out.",
                    "",
                    "It uses Windows-style key commands that can be overridden by subclassing.",
                    "Mouse select works. Here are the key commands:",
                    "",
                    "Cursor movement:     Arrow keys or mouse",
                    "Beginning of line:   Home",
                    "End of line:         End",
                    "Beginning of buffer: Control-Home",
                    "End of the buffer:   Control-End",
                    "Select text:         Hold down Shift while moving the cursor",
                    "Copy:                Control-Insert, Control-C",
                    "Cut:                 Shift-Delete,   Control-X",
                    "Paste:               Shift-Insert,   Control-V",
                    ""])


if __name__ == '__main__':
    app = wx.App()
    frame = TestFrame(None)
    frame.Show()
    app.MainLoop()

The first few error message on the command line:

(Editor_2.py:8883): Gtk-WARNING **: 13:25:30.814: drawing failure for widget 'wxPizza': invalid value for an input cairo_format_t

(Editor_2.py:8883): Gtk-WARNING **: 13:25:30.815: drawing failure for widget 'GtkScrolledWindow': invalid value for an input cairo_format_t

(Editor_2.py:8883): Gtk-WARNING **: 13:25:30.815: drawing failure for widget 'wxPizza': invalid value for an input cairo_format_t

(Editor_2.py:8883): Gtk-WARNING **: 13:25:30.815: drawing failure for widget 'wxPizza': invalid value for an input cairo_format_t

(Editor_2.py:8883): Gtk-WARNING **: 13:25:30.815: drawing failure for widget 'GtkBox': invalid value for an input cairo_format_t

(Editor_2.py:8883): Gtk-WARNING **: 13:25:30.815: drawing failure for widget 'GtkWindow': invalid value for an input cairo_format_t

(Editor_2.py:8883): Gtk-WARNING **: 13:25:30.824: drawing failure for widget 'wxPizza': invalid value for an input cairo_format_t

(Editor_2.py:8883): Gtk-WARNING **: 13:25:30.824: drawing failure for widget 'GtkScrolledWindow': invalid value for an input cairo_format_t

(Editor_2.py:8883): Gtk-WARNING **: 13:25:30.824: drawing failure for widget 'wxPizza': invalid value for an input cairo_format_t

(Editor_2.py:8883): Gtk-WARNING **: 13:25:30.824: drawing failure for widget 'wxPizza': invalid value for an input cairo_format_t

(Editor_2.py:8883): Gtk-WARNING **: 13:25:30.824: drawing failure for widget 'GtkBox': invalid value for an input cairo_format_t

[reticulatus]

Further experiments with the Code Example indicate that the OnPaint() method is repeatedly being called.

If I drag the editor's vertical scrollbar to the bottom and the horizontal scrollbar to the right, then the messages stop being generated. However, the text is never displayed.