Fedora 34 (5.14.10), KDE Plasma (5.22.5), Wayland.

After detaching the tab, the page seems to 'miss' CSS hover styles unless a new pointer event occurs (?). The included demo has a gray box that, when clicked, is obscured by a blue box. The blue box should remain visible until the pointer leaves its area.

STR:

0. Create a new profile
1. Open the included demo.html file, plus one other tab
2. Test demo.html
3. Drag the demo tab to create a new window
4. Test demo.html

Expected results:

The demo should behave the same in both tests.

Actual results:

In the detached tab's demo, the overlay box appears only while the button is held, or if a drag begins. It shows up as a red box, as it is not applying :hover styling.

mozregression reports:

Last good revision: 0f7d37986a52523e5d13f3a4a7354c689f20ee0a
First bad revision: f213f078a6d2a0e79a5632c1ead78fd6a0f4eeb1
This range contains only bug1731197 , so I've filed this in the same component.

Set release status flags based on info from the regressing bug 1731197

Thanks, will look at it.

Thanks for the testcase!

I'm testing on Fedora 34 but I'm unable to reproduce on both KDE and Gnome & latest nightly (at least how I tried to follow your steps).

Can you please create a screencast how do you use the testcase? I may use it wrongly.
https://fedoraproject.org/wiki/How_to_debug_Firefox_problems?rd=Bug_info_Firefox#Collect_information_for_a_bug_report
Thanks!

Hi, thanks for looking in to it! Attached is the requested screencast. The actions are the same in each window - just a click in the gray box.

The tab must be dropped on to the content frame (drag down beyond the navbar) - if dropped outside the window, or on the navbar, the Expected happens.

Yes, I can reproduce it but under KDE only. Works as expected in Mutter/Gnome.

Not reproducible with 2021-10-12 on KDE Wayland, Debian Testing:
MOZ_ENABLE_WAYLAND=1 MOZ_DISABLE_CONTENT_SANDBOX=1 mozregression --launch 2021-10-12 -a https://bugzilla.mozilla.org/attachment.cgi?id=9245742

Reproducible with 2021-10-12 on KDE Xwayland:
MOZ_ENABLE_WAYLAND=0 MOZ_DISABLE_CONTENT_SANDBOX=1 mozregression --launch 2021-10-12 -a https://bugzilla.mozilla.org/attachment.cgi?id=9245742

No longer reproducible on KDE Xwayland:
MOZ_ENABLE_WAYLAND=0 MOZ_DISABLE_CONTENT_SANDBOX=1 mozregression --find-fix --bad 2021-10-12 --good 2023-04-01 -a https://bugzilla.mozilla.org/attachment.cgi?id=9245742

7:41.50 INFO: First good revision: b193f2e7a6a5d1f042c957ea4acd5c89bf210512 (2021-11-18)
7:41.50 INFO: Last bad revision: 580e44ff9279ba88e3d4294621269ff8f4f23c20 (2021-11-17)
7:41.50 INFO: Pushlog:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=580e44ff9279ba88e3d4294621269ff8f4f23c20&tochange=b193f2e7a6a5d1f042c957ea4acd5c89bf210512

In this range, there are:

98d3152993c2a0d2331992f64aa01c9cdcba80a0 stransky — Bug 1741837 [Linux] Check mShell instead of mContainer for cross application D&D, r=emilio

ccb47922815f300ae3d02d1213b3561de6bb4271 stransky — Bug 1740897 [X11] Make parent container of D&D popup transparent to avoid flickering, r=emilio