[tbb-commits] [tor-browser] 38/73: Bug 1780348 - Exit fullscreen if DOMFullscreenChild is not able to continue the fullscreen transition; r=smaug, a=RyanVM

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richard pushed a commit to branch geckoview-102.3.0esr-12.0-1
in repository tor-browser.

commit bc4fafbe582699f8c44f3eb4cac733c85d9f03d8
Author: Edgar Chen <echen at mozilla.com>
AuthorDate: Mon Aug 8 20:06:32 2022 +0000

    Bug 1780348 - Exit fullscreen if DOMFullscreenChild is not able to continue the fullscreen transition; r=smaug, a=RyanVM
    
    Differential Revision: https://phabricator.services.mozilla.com/D153807
---
 browser/actors/DOMFullscreenChild.jsm | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/browser/actors/DOMFullscreenChild.jsm b/browser/actors/DOMFullscreenChild.jsm
index b0f3769dfa578..008d1e6e5cb48 100644
--- a/browser/actors/DOMFullscreenChild.jsm
+++ b/browser/actors/DOMFullscreenChild.jsm
@@ -25,6 +25,13 @@ class DOMFullscreenChild extends JSWindowActorChild {
         let remoteFrameBC = aMessage.data.remoteFrameBC;
         if (remoteFrameBC) {
           let remoteFrame = remoteFrameBC.embedderElement;
+          if (!remoteFrame) {
+            // This could happen when the page navigate away and trigger a
+            // process switching during fullscreen transition, tell the parent
+            // to just exit.
+            this.sendAsyncMessage("DOMFullscreen:Exit", {});
+            break;
+          }
           this._isNotTheRequestSource = true;
           windowUtils.remoteFrameFullscreenChanged(remoteFrame);
         } else {

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