DRYer

src/calibre/gui2/dialogs/trim_image.py

@@ -134,7 +134,6 @@ class TrimImage(QDialog):
         if d.exec() == QDialog.DialogCode.Accepted:
             width, height = d.selection_size
             self.canvas.set_selection_size_in_image_coords(width, height)
-            self.selection_changed(True)
 
     def do_trim(self):
         self.canvas.trim_image()

src/calibre/gui2/tweak_book/editor/canvas.py

@@ -590,6 +590,7 @@ class Canvas(QWidget):
                                            width * self.target.width() / i.width(), height * self.target.height() / i.height())
         self.selection_state.current_mode = 'selected'
         self.update()
+        self.selection_state_changed.emit(self.has_selection)
 
     def mouseMoveEvent(self, ev):
         changed = False