Plots: Add shortcut for the auto-fit action

- Also, change shortcuts for save/close all plots to avoid issues in
Eastern European languages.
- Add clarifying comment the usage of timers to set the scrollbar values
after a figure is loaded.

spyder/config/main.py

@@ -544,11 +544,12 @@
               'plots/previous figure': 'Ctrl+PgUp',
               'plots/next figure': 'Ctrl+PgDown',
               'plots/save': 'Ctrl+S',
-              'plots/save all': 'Ctrl+Alt+S',
+              'plots/save all': 'Alt+Shift+S',
               'plots/close': 'Ctrl+W',
-              'plots/close all': 'Ctrl+Shift+W',
+              'plots/close all': 'Alt+Shift+W',
               'plots/zoom in': "Ctrl++",
               'plots/zoom out': "Ctrl+-",
+              'plots/auto fit': "Ctrl+0",
               # -- Files --
               'explorer/copy file': 'Ctrl+C',
               'explorer/paste file': 'Ctrl+V',

spyder/plugins/plots/widgets/figurebrowser.py

@@ -476,7 +476,9 @@ def load_figure(self, fig, fmt):
         if self.current_thumbnail.scalefactor is None:
             self.current_thumbnail.scalefactor = self.scalefactor
 
-        # Restore scrollbar values
+        # Restore scrollbar values.
+        # We need to use timers for this because trying to set those values
+        # immediately after the figure is loaded doesn't work.
         QTimer.singleShot(
             20,
             lambda: self.verticalScrollBar().setValue(
@@ -545,7 +547,7 @@ def eventFilter(self, widget, event):
                 scrollBarV = self.verticalScrollBar()
                 scrollBarV.setValue(scrollBarV.value() + dy)
 
-        # Show in full size or restore the previous one
+        # Show in full size
         elif (
             event.type() == QEvent.MouseButtonDblClick
             and self.scalefactor != 0

spyder/plugins/plots/widgets/main_widget.py

@@ -44,7 +44,7 @@ class PlotsWidgetActions:
     # Toggles
     ToggleMuteInlinePlotting = 'toggle_mute_inline_plotting_action'
     ToggleShowPlotOutline = 'toggle_show_plot_outline_action'
-    ToggleAutoFitPlotting = 'toggle_auto_fit_plotting_action'
+    ToggleAutoFitPlotting = 'auto fit'
 
 
 class PlotsWidgetMainToolbarSections:
@@ -117,6 +117,7 @@ def setup(self):
             icon=self.create_icon("plot.fit_to_pane"),
             toggled=self.fit_to_pane,
             initial=False,
+            register_shortcut=True,
         )
 
         # Toolbar actions