Fix #6726 (Alt-M keyboard shortcut added for Merge - keep others (Safe Merge))

src/calibre/gui2/actions/edit_metadata.py

@@ -51,7 +51,8 @@ class EditMetadataAction(InterfaceAction):
                 self.merge_books)
         mb.addSeparator()
         mb.addAction(_('Merge into first selected book - keep others'),
-                partial(self.merge_books, safe_merge=True))
+                partial(self.merge_books, safe_merge=True),
+                Qt.AltModifier+Qt.Key_M)
         self.merge_menu = mb
         self.action_merge.setMenu(mb)
         md.addSeparator()

src/calibre/manual/gui.rst

@@ -345,6 +345,8 @@ Calibre has several keyboard shortcuts to save you time and mouse movement. Thes
       - Show book details
     * - :kbd:`M` 
       - Merge selected records
+    * - :kbd:`Alt+M` 
+      - Merge selected records, keeping originals
     * - :kbd:`O` 
       - Open containing folder
     * - :kbd:`S`