Add workspaces_only_on_primary preferences (default FALSE)

This adds a preference that when enabled makes all windows not on
the primary monitor be visible on all workspaces (i.e. not part of the
workspace switching handling).

https://bugzilla.gnome.org/show_bug.cgi?id=609258

src/core/prefs.c

@@ -67,6 +67,7 @@
 #define KEY_WORKSPACE_NAME_PREFIX "/apps/metacity/workspace_names/name_"
 
 #define KEY_LIVE_HIDDEN_WINDOWS "/apps/mutter/general/live_hidden_windows"
+#define KEY_WORKSPACES_ONLY_ON_PRIMARY "/apps/mutter/general/workspaces_only_on_primary"
 
 #define KEY_NO_TAB_POPUP "/apps/metacity/general/no_tab_popup"
 
@@ -114,6 +115,7 @@ static char *terminal_command = NULL;
 static char *workspace_names[MAX_REASONABLE_WORKSPACES] = { NULL, };
 
 static gboolean live_hidden_windows = FALSE;
+static gboolean workspaces_only_on_primary = FALSE;
 
 static gboolean no_tab_popup = FALSE;
 
@@ -421,6 +423,11 @@ static MetaBoolPreference preferences_bool[] =
       &live_hidden_windows,
       FALSE,
     },
+    { "/apps/mutter/general/workspaces_only_on_primary",
+      META_PREF_WORKSPACES_ONLY_ON_PRIMARY,
+      &workspaces_only_on_primary,
+      FALSE,
+    },
     { "/apps/metacity/general/no_tab_popup",
       META_PREF_NO_TAB_POPUP,
       &no_tab_popup,
@@ -1973,6 +1980,9 @@ meta_preference_to_string (MetaPreference pref)
     case META_PREF_LIVE_HIDDEN_WINDOWS:
       return "LIVE_HIDDEN_WINDOWS";
 
+    case META_PREF_WORKSPACES_ONLY_ON_PRIMARY:
+      return "WORKSPACES_ONLY_ON_PRIMARY";
+
     case META_PREF_NO_TAB_POPUP:
       return "NO_TAB_POPUP";
     }
@@ -2993,6 +3003,13 @@ meta_prefs_set_live_hidden_windows (gboolean whether)
 #endif
 }
 
+gboolean
+meta_prefs_get_workspaces_only_on_primary (void)
+{
+  return workspaces_only_on_primary;
+}
+
+
 gboolean
 meta_prefs_get_no_tab_popup (void)
 {

src/core/window.c

@@ -1574,7 +1574,9 @@ should_be_on_all_workspaces (MetaWindow *window)
 {
   return
     window->on_all_workspaces_requested ||
-    window->override_redirect;
+    window->override_redirect ||
+    (meta_prefs_get_workspaces_only_on_primary () &&
+     !meta_window_is_on_primary_monitor (window));
 }
 
 void
@@ -4081,7 +4083,28 @@ meta_window_get_monitor (MetaWindow *window)
 void
 meta_window_update_monitor (MetaWindow *window)
 {
+  const MetaMonitorInfo *old;
+
+  old = window->monitor;
   window->monitor = meta_screen_get_monitor_for_window (window->screen, window);
+  if (old != window->monitor)
+    {
+      meta_window_update_on_all_workspaces (window);
+
+      /* If workspaces only on primary and we moved back to primary, ensure that the
+       * window is now in that workspace. We do this because while the window is on a
+       * non-primary monitor it is always visible, so it would be very jarring if it
+       * disappeared when it crossed the monitor border.
+       * The one time we want it to both change to the primary monitor and a non-active
+       * workspace is when dropping the window on some other workspace thumbnail directly.
+       * That should be handled by explicitly moving the window before changing the
+       * workspace
+       */
+      if (meta_prefs_get_workspaces_only_on_primary () &&
+          meta_window_is_on_primary_monitor (window)  &&
+          window->screen->active_workspace != window->workspace)
+        meta_window_change_workspace (window, window->screen->active_workspace);
+    }
 }
 
 static void

src/meta/prefs.h

@@ -62,6 +62,7 @@ typedef enum
   META_PREF_EDGE_TILING,
   META_PREF_FORCE_FULLSCREEN,
   META_PREF_LIVE_HIDDEN_WINDOWS,
+  META_PREF_WORKSPACES_ONLY_ON_PRIMARY,
   META_PREF_NO_TAB_POPUP
 } MetaPreference;
 
@@ -136,6 +137,8 @@ void meta_prefs_set_force_fullscreen (gboolean whether);
 gboolean meta_prefs_get_live_hidden_windows (void);
 void     meta_prefs_set_live_hidden_windows (gboolean whether);
 
+gboolean meta_prefs_get_workspaces_only_on_primary (void);
+
 gboolean meta_prefs_get_no_tab_popup (void);
 void     meta_prefs_set_no_tab_popup (gboolean whether);
 

src/mutter.schemas.in

@@ -53,5 +53,20 @@
         </long>
       </locale>
     </schema>
+
+    <schema>
+      <key>/schemas/apps/mutter/general/workspaces_only_on_primary</key>
+      <applyto>/apps/mutter/general/workspaces_only_on_primary</applyto>
+      <owner>mutter</owner>
+      <type>bool</type>
+      <default>false</default>
+      <locale name="C">
+        <short>Workspaces only on primary</short>
+        <long>
+          Determines whether workspace switching should happen for windows
+	  on all monitors or only the primary window.
+        </long>
+      </locale>
+    </schema>
     </schemalist>
 </gconfschemafile>