remove unused stack-down action. Added here but never implemented http://sourceforge.net/p/mscore/code/4066/

Author: lasconic

mscore/actions.cpp

@@ -2274,13 +2274,6 @@ Shortcut Shortcut::sc[] = {
          QT_TRANSLATE_NOOP("action","Replace pitches without changing rhythms"),
          Icons::repitch_ICON
          ),
-      Shortcut(
-         MsWidget::MAIN_WINDOW,
-         STATE_NORMAL | STATE_NOTE_ENTRY,
-         0,
-         "stack-down",
-         QT_TRANSLATE_NOOP("action","Stack down")
-         ),
       Shortcut(
          MsWidget::MAIN_WINDOW,
          STATE_NORMAL | STATE_NOTE_ENTRY,

mscore/data/shortcuts.xml

@@ -716,10 +716,6 @@
     <key>repitch</key>
     <seq>Ctrl+Shift+I</seq>
     </SC>
-  <SC>
-    <key>stack-down</key>
-    <seq>Shift+Z</seq>
-    </SC>
   <SC>
     <key>toogle-piano</key>
     <seq>P</seq>