[gnome-shell/wip/carlosg/grabs-pt2: 5/11] main: Use Clutter.grab() underneath Main.push/popModal

[Carlos Garnacho <carlosg src gnome org>]

commit 2e9706b39e2180d0e9497dfde20895b335f5a6c0
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Nov 18 00:36:44 2021 +0100

    main: Use Clutter.grab() underneath Main.push/popModal

 js/ui/main.js | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)
---
diff --git a/js/ui/main.js b/js/ui/main.js
index c7bac11f25..4767de0b86 100644
--- a/js/ui/main.js
+++ b/js/ui/main.js
@@ -523,13 +523,8 @@ function pushModal(actor, params) {
                                     options: 0,
                                     actionMode: Shell.ActionMode.NONE });
 
-    if (modalCount == 0) {
-        if (!global.begin_modal(params.timestamp, params.options)) {
-            log('pushModal: invocation of begin_modal failed');
-            return false;
-        }
+    if (modalCount === 0)
         Meta.disable_unredirect_for_display(global.display);
-    }
 
     modalCount += 1;
     let actorDestroyId = actor.connect('destroy', () => {
@@ -549,11 +544,14 @@ function pushModal(actor, params) {
                 modalActorFocusStack[index].prevFocus = null;
         });
     }
+    let grab = Clutter.grab(global.stage, actor);
     modalActorFocusStack.push({ actor,
-                                destroyId: actorDestroyId,
-                                prevFocus,
-                                prevFocusDestroyId,
-                                actionMode });
+        grab,
+        destroyId: actorDestroyId,
+        prevFocus,
+        prevFocusDestroyId,
+        actionMode,
+    });
 
     actionMode = params.actionMode;
     global.stage.set_key_focus(actor);
@@ -581,7 +579,6 @@ function popModal(actor, timestamp) {
     let focusIndex = _findModal(actor);
     if (focusIndex < 0) {
         global.stage.set_key_focus(null);
-        global.end_modal(timestamp);
         actionMode = Shell.ActionMode.NORMAL;
 
         throw new Error('incorrect pop');
@@ -592,6 +589,9 @@ function popModal(actor, timestamp) {
     let record = modalActorFocusStack[focusIndex];
     record.actor.disconnect(record.destroyId);
 
+    let grab = record.grab;
+    Clutter.ungrab(grab);
+
     if (focusIndex == modalActorFocusStack.length - 1) {
         if (record.prevFocus)
             record.prevFocus.disconnect(record.prevFocusDestroyId);
@@ -629,7 +629,6 @@ function popModal(actor, timestamp) {
         return;
 
     layoutManager.modalEnded();
-    global.end_modal(timestamp);
     Meta.enable_unredirect_for_display(global.display);
     actionMode = Shell.ActionMode.NORMAL;
 }