diff -up xfwm4-4.12.3/src/workspaces.c.z-xfwm4-menu-position-fix xfwm4-4.12.3/src/workspaces.c
--- xfwm4-4.12.3/src/workspaces.c.z-xfwm4-menu-position-fix
+++ xfwm4-4.12.3/src/workspaces.c
@@ -580,7 +580,7 @@ workspaceUpdateArea (ScreenInfo *screen_
                                                        c->struts[STRUTS_TOP]);
             }
 
-            if (checkValidStruts (&bottom, &workarea, STRUTS_BOTTOM) ||
+            if (checkValidStruts (&bottom, &workarea, STRUTS_BOTTOM) &&
                 gdk_rectangle_intersect (&bottom, &workarea, NULL))
             {
                 screen_info->margins[STRUTS_BOTTOM] = MAX(screen_info->margins[STRUTS_BOTTOM],