ensure button status is correctly set when editor opens

The `loadNote` / `editor_did_load_note` hooks run as soon as a note is loaded, but not necesarrily after the ui component has been mounted to the DOM. By adding a delay of 50 ms before setting button state, this should help alleviate the race condition.

chinese/edit.py

@@ -33,40 +33,48 @@ def __init__(self):
         addHook('editFocusLost', self.onFocusLost)
 
     def setupButton(self, buttons: list[str], editor: aqt.editor.Editor):
-        self.buttonOn = False
-        editor._links['chineseSupport'] = self.onToggle
+        # the button starts as toggled off
+        self.ui_button_toggled_on = False
 
-        button = editor._addButton(
+        button = editor.addButton(
             icon=None,
             cmd='chineseSupport',
+            func=self.onToggle,
             tip='Chinese Support',
             label='<b>汉字</b>',
             id='chineseSupport',
-            toggleable=True)
+            toggleable=True
+        )
 
         return buttons + [button]
 
-    def onToggle(self, editor):
-        self.buttonOn = not self.buttonOn
+    def onToggle(self, editor: aqt.editor.Editor):
+        self.ui_button_toggled_on = not self.ui_button_toggled_on
 
         mid = str(editor.note.note_type()['id'])
 
-        if self.buttonOn and mid not in config['enabledModels']:
+        if self.ui_button_toggled_on and mid not in config['enabledModels']:
             config['enabledModels'].append(mid)
-        elif not self.buttonOn and mid in config['enabledModels']:
+        elif not self.ui_button_toggled_on and mid in config['enabledModels']:
             config['enabledModels'].remove(mid)
 
         config.save()
 
-    def updateButton(self, editor):
-        enabled = str(editor.note.note_type()['id']) in config['enabledModels']
+    def updateButton(self, editor: aqt.editor.Editor):
+        should_be_enabled = str(editor.note.note_type()['id']) in config['enabledModels']
 
-        if (enabled and not self.buttonOn) or (not enabled and self.buttonOn):
-            editor.web.eval('toggleEditorButton(chineseSupport);')
-            self.buttonOn = not self.buttonOn
+        # if the ui button does not match the state it should be in, then bring it into sync
+        if should_be_enabled != self.ui_button_toggled_on:
+
+            def toggle_button_status():
+                editor.web.eval('toggleEditorButton(document.getElementById("chineseSupport"));')
+                self.ui_button_toggled_on = should_be_enabled
+
+            # give NoteEditor component time to mount to the DOM to sure that toggleEditorButton has been injected
+            mw.progress.single_shot(50, toggle_button_status)
 
     def onFocusLost(self, changed: bool, note: anki.notes.Note, index: int):
-        if not self.buttonOn:
+        if not self.ui_button_toggled_on:
             return changed
 
         we_changed = False