Bug 444661

Summary:	When using a top panel (Application Menu Bar), dragging a Firefox tab to the top of the screen does not maximize the window.
Product:	[Plasma] kwin	Reporter:	evanmohr22
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	wishlist	CC:	ashark, nate
Priority:	NOR
Version First Reported In:	5.23.2
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description evanmohr22 2021-10-30 13:35:30 UTC

SUMMARY
In KDE, you can drag a window to the top of the screen in order to quickly maximize the window. However, using a top panel can disrupt this shortcut for certain apps, the most notable being Firefox; if you try to drag a tab out of Firefox and drag it to the top of the screen, it does not work because it tries to interact with the top panel instead. A user could avoid this issue by aiming the cursor below the top panel, but this is a disruption to muscle memory.

YouTube video demonstrating the issue: https://youtu.be/lDNacyFONzc

STEPS TO REPRODUCE
1. Add a top panel to your desktop (referred to as an Application Menu Bar)
2. Open Firefox and have two tabs open
3. Drag one of the tabs to the top of the screen where the top bar resides

OBSERVED RESULT
The cursor displays a little plus icon over the document icons. The widgets in the top panel may shuffle a bit. When letting go of left-click, nothing happens.

EXPECTED RESULT
I would expect for the Firefox tab to open in a new, maximized window.

SOFTWARE/OS VERSIONS
Distro: Arch Linux
Linux version: 5.14.14
KDE Plasma Version: 5.23.2
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2

Comment 1 Nate Graham 2021-11-01 15:43:42 UTC

X11 or Wayland?

Comment 2 evanmohr22 2021-11-01 19:59:43 UTC

It definitely occurs in X11, and I'm fairly sure it occurs on Wayland as well.

Comment 3 Andrew Shark 2023-09-07 00:02:03 UTC

> I would expect for the Firefox tab to open in a new, maximized window.
Why are you sure you can expect that? What are you dragging is not a window type, it is a tab. And if you drop it, outside of any firefox window, the window will be created with that tab. After that you can work with that window as usual.

Also, I run firefox with MOZ_ENABLE_WAYLAND=1, and when I drop its tab outside of firefox window (even when hitting top edge), the new firefox window appears with that tab (the size corresponds parent firefox window, not exactly maximized).

Operating System: Arch Linux 
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.109.0
Qt Version: 5.15.10
Graphics Platform: Wayland
Firefox: 117.0

Comment 4 Nate Graham 2023-09-07 15:45:44 UTC

I think this is just a side effect of Bug 436601. KWin doesn't know that the tab is actually a window so it can't interpret the drag as the intent to both tear off the tab and maximize it.

*** This bug has been marked as a duplicate of bug 436601 ***