Bugzilla

**Note**
* When the user loads a long enough TikTok video, unmutes, enables PiP and then double-clicks the Pip window to go into full screen, he will notice that the video will also pause when it shouldn't.

**Affected versions**
* Nightly v98.0a1
* Beta v97.0b4

**Affected platforms**
* all

**Steps to reproduce**
1. Load https://www.tiktok.com/foryou?is_copy_url=1&is_from_webapp=v1
2. Scroll to a video that's long enough to have PiP.
3. Unmute (not necessary, but makes the issue stand out)
4. Activate PiP
5. Double-click the PiP window to enter full screen.
actual: goes fullscreen AND pauses the video
expected: goes fullscreen and continues playing

**Expected result**
* Goes fullscreen and continues playing.

**Actual result**
* Goes fullscreen AND pauses the video.

**Regression range**
* Appears to be a regression from Fx97:
2022-01-17T20:45:30.961000: DEBUG : Found commit message:
Bug 1732736 - Enable window occlusion on Nightly on Windows r=jrmuizel,gfx-reviewers
Differential Revision: https://phabricator.services.mozilla.com/D127366
2022-01-17T20:45:30.961000: DEBUG : Did not find a branch, checking all integration branches
2022-01-17T20:45:30.963000: INFO : The bisection is done.

**Additional notes**
* This issue appears to only reproduce on the main monitor (in case of more than one monitor connected to the machine).

**Note**
* When the user loads a long enough TikTok video, unmutes, enables PiP and then double-clicks the Pip window to go into full screen, he will notice that the video will also pause when it shouldn't.

**Affected versions**
* Nightly v98.0a1
* Beta v97.0b4

**Affected platforms**
* all

**Steps to reproduce**
1. Load https://www.tiktok.com/foryou?is_copy_url=1&is_from_webapp=v1
2. Scroll to a video that's long enough to have PiP.
3. Unmute (not necessary, but makes the issue stand out)
4. Activate PiP
5. Double-click the PiP window to enter full screen.
actual: goes fullscreen AND pauses the video
expected: goes fullscreen and continues playing

**Expected result**
* Goes fullscreen and continues playing.

**Actual result**
* Goes fullscreen AND pauses the video.

**Regression range**
* Appears to be a regression from Fx97:
2022-01-17T20:45:30.961000: DEBUG : Found commit message:
Bug 1732736 - Enable window occlusion on Nightly on Windows r=jrmuizel,gfx-reviewers
Differential Revision: https://phabricator.services.mozilla.com/D127366
2022-01-17T20:45:30.961000: DEBUG : Did not find a branch, checking all integration branches
2022-01-17T20:45:30.963000: INFO : The bisection is done.

**Additional notes**
* This issue appears to only reproduce on the main monitor (in case of more than one monitor connected to the machine).
* It does not occur in with Youtube videos.