Bug 428320

Summary: Double-click window frame should horizontally or vertically maximize
Product: [Plasma] kwin Reporter: pat_h
Component: generalAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED FIXED    
Severity: wishlist CC: john.kde, kde, xaver.hugl
Priority: NOR    
Version First Reported In: 5.17.5   
Target Milestone: ---   
Platform: Debian testing   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description pat_h 2020-10-27 03:10:26 UTC 
SUMMARY
When moving the cursor on the window's border (not the edges) a vertical or horizontal cursor appears. When double clicking there, the corresponding window should be vertically or horizontally maximized.

STEPS TO REPRODUCE
1. Move cursor on window border
2. Double click

OBSERVED RESULT
Nothing happens, except if the cursor is on the top edge, then we get full maximization (horizontally and vertically)

EXPECTED RESULT
Vertical maximization after double-clicking on the top and bottom edges
Horizontal maximization after double-clicking the left and right edges 

SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.14.2
Kernel Version: 5.9.0-1-amd64
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-6500 CPU @ 3.20GHz
Memory: 11,6 GiB

ADDITIONAL INFORMATION
Internally there seem to be two implementation possibilities (at least for x11): A true vertical or horizontal maximization state or just increasing the window's size. I am not sure, what would be better. I think either implementation would improve things – it could be changed later if we see advantages of the other implementation.

I think I have this feature in my mind for more than a decade. Since Windows started to support that feature also about one decade ago, I guess it's time to have it available in Plasma, too. :-)
Comment 1 John Veness 2023-02-19 12:36:14 UTC 
I note that there are already vertically maximize and horizontally maximize actions available in System Settings, Window Management, Window Behavior, Titlebar Actions, which are mapped to different single clicks on the maximize button by default. So, we don't need to decide in this bug whether it should be a window resize or "true" maximize as you put it, just make these actions available to double-clicking on the frames.

Having used this feature in Windows for years I agree it is very useful, and once you know about it, it is easier to remember and more logical than right-clicking or middle-clicking the maximise button (I can never remember which will do which action, and right-click/middle-click is hard on a trackpad). Plus, often when you are thinking about making a window larger in one direction you already have the mouse hovering over one side of the frame, so double-clicking the frame is easy at this point.
Comment 2 David Edmundson 2024-04-25 14:32:37 UTC 
It does.
Comment 3 John Veness 2024-04-25 14:36:50 UTC 
(In reply to David Edmundson from comment #2)
> It does.

What does? As far as I can tell, the described desired behaviour does not currently happen.
Comment 4 pat_h 2024-04-26 06:24:21 UTC 
(In reply to David Edmundson from comment #2)
> It does.

Is this configurable or a Plasma 6 thing? Here on Plasma 5 and Wayland with my current configuration I do not get the window only vertically or horizontally maximized via double click on the edges.
If you have this behavior, do you know how you achieved it?
Comment 5 John Veness 2024-08-19 19:42:31 UTC 
It looks like this was added in Plasma 6.
Comment 6 Zamundaaa 2024-08-19 19:54:48 UTC 
Yes, it was added in 6.1: https://invent.kde.org/plasma/kwin/-/merge_requests/5154