CTRL does not fix aspect in zoom-to-rect mode.

anntzer · anntzer · commit 1384627c18cd · 2021-09-19T13:11:43.000+02:00
This has been the case since at least mpl2.0, so let's just fix the doc
for now.  Likely there was some confusion with zoom/pan mode, where CTRL
does fix the aspect.
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -2911,8 +2911,7 @@ class NavigationToolbar2:
          'Left button pans, Right button zooms\n'
          'x/y fixes axis, CTRL fixes aspect',
          'move', 'pan'),
-        ('Zoom', 'Zoom to rectangle\nx/y fixes axis, CTRL fixes aspect',
-         'zoom_to_rect', 'zoom'),
+        ('Zoom', 'Zoom to rectangle\nx/y fixes axis', 'zoom_to_rect', 'zoom'),
         ('Subplots', 'Configure subplots', 'subplots', 'configure_subplots'),
         (None, None, None, None),
         ('Save', 'Save the figure', 'filesave', 'save_figure'),
