Add deck_conf_did_setup_ui_form hook

Called earlier than deck_conf_will_show, allowing add-on authors
to perform UI modifications before the deck config is loaded.

qt/aqt/deckconf.py

@@ -29,6 +29,7 @@ class DeckConf(QDialog):
         self._origNewOrder = None
         self.form = aqt.forms.dconf.Ui_Dialog()
         self.form.setupUi(self)
+        gui_hooks.deck_conf_did_setup_ui_form(self)
         self.mw.checkpoint(_("Options"))
         self.setupCombos()
         self.setupConfs()

qt/aqt/gui_hooks.py

@@ -544,6 +544,32 @@ class _DeckConfDidLoadConfigHook:
 deck_conf_did_load_config = _DeckConfDidLoadConfigHook()
 
 
+class _DeckConfDidSetupUiFormHook:
+    """Allows modifying or adding widgets in the deck options UI form"""
+
+    _hooks: List[Callable[["aqt.deckconf.DeckConf"], None]] = []
+
+    def append(self, cb: Callable[["aqt.deckconf.DeckConf"], None]) -> None:
+        """(deck_conf: aqt.deckconf.DeckConf)"""
+        self._hooks.append(cb)
+
+    def remove(self, cb: Callable[["aqt.deckconf.DeckConf"], None]) -> None:
+        if cb in self._hooks:
+            self._hooks.remove(cb)
+
+    def __call__(self, deck_conf: aqt.deckconf.DeckConf) -> None:
+        for hook in self._hooks:
+            try:
+                hook(deck_conf)
+            except:
+                # if the hook fails, remove it
+                self._hooks.remove(hook)
+                raise
+
+
+deck_conf_did_setup_ui_form = _DeckConfDidSetupUiFormHook()
+
+
 class _DeckConfWillSaveConfigHook:
     """Called before widget state is saved to config"""
 

qt/tools/genhooks_gui.py

@@ -123,6 +123,11 @@ hooks = [
     ),
     # Deck options
     ###################
+    Hook(
+        name="deck_conf_did_setup_ui_form",
+        args=["deck_conf: aqt.deckconf.DeckConf"],
+        doc="Allows modifying or adding widgets in the deck options UI form",
+    ),
     Hook(
         name="deck_conf_will_show",
         args=["deck_conf: aqt.deckconf.DeckConf"],