Make Qt toolbar more resilient against removal of tool buttons.

anntzer · anntzer · commit 4eb188a34fa0 · 2019-09-08T18:10:29.000+02:00
diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
@@ -753,8 +753,10 @@ def edit_parameters(self):
 
     def _update_buttons_checked(self):
         # sync button checkstates to match active mode
-        self._actions['pan'].setChecked(self._active == 'PAN')
-        self._actions['zoom'].setChecked(self._active == 'ZOOM')
+        if 'pan' in self._actions:
+            self._actions['pan'].setChecked(self._active == 'PAN')
+        if 'zoom' in self._actions:
+            self._actions['zoom'].setChecked(self._active == 'ZOOM')
 
     def pan(self, *args):
         super().pan(*args)
