fix: remove qt disconnect warning (#613)

* fix: cannot disconnect from None Warning

* fix: cannot disconnect from None Warning mypy compliant

Author: Thesacraft

tagstudio/src/qt/widgets/fields.py

@@ -113,25 +113,23 @@ def set_copy_callback(self, callback: Optional[MethodType]):
 
         self.copy_callback = callback
         self.copy_button.clicked.connect(callback)
-        if callback is not None:
-            self.copy_button.is_connected = True
+        self.copy_button.is_connected = callable(callback)
 
     def set_edit_callback(self, callback: Callable):
         if self.edit_button.is_connected:
             self.edit_button.clicked.disconnect()
 
         self.edit_callback = callback
         self.edit_button.clicked.connect(callback)
-        if callback is not None:
-            self.edit_button.is_connected = True
+        self.edit_button.is_connected = callable(callback)
 
     def set_remove_callback(self, callback: Callable):
         if self.remove_button.is_connected:
             self.remove_button.clicked.disconnect()
 
         self.remove_callback = callback
         self.remove_button.clicked.connect(callback)
-        self.remove_button.is_connected = True
+        self.remove_button.is_connected = callable(callback)
 
     def set_inner_widget(self, widget: "FieldWidget"):
         if self.field_layout.itemAt(0):

tagstudio/src/qt/widgets/preview_panel.py

@@ -875,10 +875,6 @@ def write_container(self, index: int, field: BaseField, is_mixed: bool = False):
         else:
             container = self.containers[index]
 
-        container.set_copy_callback(None)
-        container.set_edit_callback(None)
-        container.set_remove_callback(None)
-
         if isinstance(field, TagBoxField):
             container.set_title(field.type.name)
             container.set_inline(False)