RichTextFieldTypeStandard does not resize


I am using Fedora 35 on Wayland, Python 3.9 and wxpython 4.1.1

I am using a custom RichTextFieldTypeStandard class to display images in RichTextCtrl.
I have trouble convincing the the image field to correctly adjust it’s size when the image it is showing is changed. Below is a minimal working example.

To reproduce the issue:

  1. Run the script and click the Img button.
  2. Select a jpg image which it will show in the ctrl.
  3. Right click on the image and select Edit image.
  4. Select a smaller image (width and height) than the one currently shown.

The field will show the new image but the size of the field remains the same until the window is resized.
How do I convince the field to change size immediately?

import wx
import wx.richtext as rt
from wx.richtext import RichTextField, RichTextCtrl, RichTextBuffer, RichTextFieldTypeStandard

class RichTextFrame(wx.Frame):
    def __init__(self, *args, **kw):
        wx.Frame.__init__(self, *args, **kw)
        self.rtc = rt.RichTextCtrl(self, style=wx.VSCROLL | wx.HSCROLL | wx.NO_BORDER)
        self.sizer = wx.BoxSizer(wx.VERTICAL)

        self._button = wx.Button(self, wx.ID_APPLY, 'Img')
        self.Bind(wx.EVT_BUTTON, self.insert_image, self._button)
        self.sizer.Add(self.rtc, 1, flag=wx.EXPAND)

    def insert_image(self, event: wx.CommandEvent) -> None:
        Open a file dialog to insert an image.
        :param event: Not used.
        :return: None
        image_path = ''
        with wx.FileDialog(self, 'Select image', '.', style=wx.FD_OPEN | wx.FD_FILE_MUST_EXIST | wx.FD_PREVIEW) as dlg:
            if dlg.ShowModal() == wx.ID_OK:
                dlg: wx.FileDialog
                image_path = dlg.GetPath()

        field_type = ImageTextField(image_path)

        position = self.rtc.GetAdjustedCaretPosition(self.rtc.GetCaretPosition())
        buffer: rt.RichTextBuffer = self.rtc.GetFocusObject()
        buffer.InsertFieldWithUndo(self.rtc.GetBuffer(), position, field_type.GetName(), rt.RichTextProperties(),
                                   self.rtc, rt.RICHTEXT_INSERT_NONE, rt.RichTextAttr())

class ImageTextField(RichTextFieldTypeStandard):
    Custom RichTextFieldType class with image edit dialog.

    def __init__(self, img_path: str):
        Constructor for a custom label for displaying images with ability to edit.
        :param img_path: Path to image.
        self._img = img_path
        super().__init__('1', bitmap=wx.Bitmap(wx.Image(img_path, wx.BITMAP_TYPE_ANY)),

    def CanEditProperties(self, obj: RichTextField) -> bool:
        Rerun True if the user can edit the label's properties.
        :param obj: Unused
        :return: True
        return True

    def GetPropertiesMenuLabel(self, obj: RichTextField) -> str:
        Returns the label to be used for the properties' context menu item.
        :param obj: Unused
        :return: Label for the context menu.
        return 'Edit image'

    def EditProperties(self, obj: RichTextField, parent: RichTextCtrl, buffer: RichTextBuffer) -> None:
        Edits the object's properties via a GUI.
        :param obj: The RichTextField object that has been clicked.
        :param parent: RichTextControl which contains the field.
        :param buffer: The buffer of the control.
        :return: The result of the GUI dialog.
        image_path = ''
        with wx.FileDialog(parent, 'Select img', '.', style=wx.FD_OPEN | wx.FD_FILE_MUST_EXIST | wx.FD_PREVIEW) as dlg:
            if dlg.ShowModal() == wx.ID_OK:
                dlg: wx.FileDialog
                image_path = dlg.GetPath()

    def update_image(self, img_path: str) -> None:
        Redraw the image according to the seo status.
        :param img_path: Path to image.
        :return: None
        # TODO changing the image size to a smaller image does not change the label size
        self.SetBitmap(wx.Bitmap(wx.Image(img_path, wx.BITMAP_TYPE_ANY)))

class MyApp(wx.App):
    Main class for running the gui

    def __init__(self):
        self.frame = None

    def OnInit(self):
        self.frame = RichTextFrame(None, -1, "RichTextCtrl", size=(700, 700), style=wx.DEFAULT_FRAME_STYLE)
        return True

if __name__ == "__main__":
    app = MyApp()

Looks like calling Invalidate() on the richtextctrl before Refresh() does the trick.