Add the keyboard shortcut: Ctrl+Shift+R to restart calibre in debug mode

src/calibre/gui2/actions/preferences.py

@@ -25,8 +25,11 @@ def genesis(self):
                 self.gui.run_wizard)
         if not DEBUG:
             pm.addSeparator()
-            pm.addAction(QIcon(I('debug.png')), _('Restart in debug mode'),
+            ac = pm.addAction(QIcon(I('debug.png')), _('Restart in debug mode'),
                 self.debug_restart)
+            ac.setShortcut('Ctrl+Shift+R')
+            self.gui.addAction(ac)
+
         self.qaction.setMenu(pm)
         self.preferences_menu = pm
         for x in (self.gui.preferences_action, self.qaction):

src/calibre/manual/gui.rst

@@ -549,6 +549,8 @@ Calibre has several keyboard shortcuts to save you time and mouse movement. Thes
       - Download metadata and shortcuts
     * - :kbd:`Ctrl+R`
       - Restart calibre
+    * - :kbd:`Ctrl+Shift+R`
+      - Restart calibre in debug mode
     * - :kbd:`Shift+Ctrl+E`
       - Add empty books to calibre
     * - :kbd:`Ctrl+Q`