1615217 - The window is 'transparent' after toggling title bar

Status: UNCONFIRMED

(Core :: Widget: Gtk, defect)

Description

[rapiz]

Attachment: untitled.webm

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:73.0) Gecko/20100101 Firefox/73.0

Steps to reproduce:

1. Click the checkbox of 'Title Bar' twice in 'Customize'
2. Click the right half area of firefox
3. Scroll when the cursor is in the right half area of firefox

Actual results:

No operations will reach firefox. They act as if there is no firefox window. Windows behind will receive these operations.

Expected results:

Firefox should handle these operations.

Comment 1

[rapiz]

Sorry for missing one step to reproduce.
Here's the complete version:

Steps to reproduce:

1. Click the checkbox of 'Title Bar' twice in 'Customize'
2. Maximize firefox
3. Click the right half area of firefox
4. Scroll when the cursor is in the right half area of firefox

And I attach a video to fully present this problem. It showed:

1. When firefox not maximized, clicking on the 'Preference' button worked as expected.
2. When firefox maximized, clicks didn't work.
3. After restoring window size, clicks worked.
4. After maximizing again, a click on the firefox can reach the window behind, which brought the window in front of firefox (the sliding in effect came from KDE and had nothing to do with this bug). And scrolling can cause KDE switching virtual desktops, which is the behavior when you scrolling on the desktop.

In brief, everything acted as if the firefox window is 'transparent'.

Additional information:

Operating System: Arch Linux 
KDE Plasma Version: 5.18.0
KDE Frameworks Version: 5.67.0
Qt Version: 5.14.1
Kernel Version: 5.5.2-arch1-1
OS Type: 64-bit
Processors: 4 × Intel® Core™ i7-6600U CPU @ 2.60GHz
Memory: 19.4 GiB of RAM