Visually align shortcuts in menus

In a menu, we use the right side both for submenu arrows and shortcuts.
As a result, when an entry has both a shortcut and a submenu, its
shortcut is not aligned with others, and this does not look so nice.

The spacing for the arrow appears only if there is a submenu in any of
the items in the parent menu.

Change-Id: If91fdcdad36abb0141fb05d1f59141f89540c1db
Reviewed-on: https://review.haiku-os.org/c/haiku/+/355
Reviewed-by: Adrien Destugues <[email protected]>
Reviewed-by: Ryan Leavengood <[email protected]>

headers/os/interface/Menu.h

@@ -313,7 +313,7 @@ private:
 			bool				fStickyMode;
 			bool				fIgnoreHidden;
 			bool				fTriggerEnabled;
-			bool				fRedrawAfterSticky;
+			bool				fHasSubmenus;
 			bool				fAttachAborted;
 };
 

headers/os/interface/MenuItem.h

@@ -91,7 +91,7 @@ private:
 			rgb_color			_HighColor();
 
 			void				_DrawMarkSymbol();
-			void				_DrawShortcutSymbol();
+			void				_DrawShortcutSymbol(bool);
 			void				_DrawSubmenuSymbol();
 			void				_DrawControlChar(char shortcut, BPoint where);