The mpv video player resizes windows in a way to keep the aspect-ratio of the video. When MMB-clicking on the maximize button to maximize only vertically, the player used to also resize horizontally. Now, the window really only resizes vertically, so the video doesn't get any larger. I have not updated mpv, only kwin from Qt 5 version to Qt 6 version, so this might be a regression. If this is intended new behaviour, and a mpv needs to be adapted, please close. KWin X11 version is at 18cdcc81.
Thanks for filing this bug report. Unfortunately there isn't enough information for us to try to figure out what's happening. Please add information about your system as requested in the bug report template. Copy and paste this with the information into a new comment. SOFTWARE/OS VERSIONS (available in the Info Center app, or by running `kinfo` in a terminal window) KDE Plasma Version: KDE Frameworks Version: Qt Version: Thanks for your understanding
The git hash for KWin X11 was added at comment #0.
(In reply to Christoph Feck from comment #2) > The git hash for KWin X11 was added at comment #0. We still need KDE Plasma Version: KDE Frameworks Version: Qt Version: Also, ideally, what distro you're running. Thanks
Distribution is openSUSE Tumbleweed with KDE:Unstable:Frameworks (git master builds) repository. 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KDE Plasma Version: 6.4.80 KDE Frameworks Version: 6.17.0
Note: Enabling middle click to maximize a window vertically is set in System Settings -> Window Management -> Window Behavior -> Titlebar Actions -> Maximize Button Actions (which is the default0 This will work with all windows. I confirm the bug with git-master - the maximize button in mpv does not respond to middle click unless a video is playing. With a video playing, middle click just moves the window up a little, but doesn't enlarge the video at all. Other windows maximize vertically as expected, including Haruna. I don't know if the root cause is in mpv or kwin, I'll let the developers make that determination.
Does it happen on Wayland, too?
(In reply to Nate Graham from comment #7) > Does it happen on Wayland, too? I had tested with Wayland
(In reply to Christoph Feck from comment #0) > The mpv video player resizes windows in a way to keep the aspect-ratio of > the video. When MMB-clicking on the maximize button to maximize only > vertically, the player used to also resize horizontally. Now, the window > really only resizes vertically, so the video doesn't get any larger. Tbh there isn't anything super good that can be done with vertically maximizing a video - the "before" behavior also sounds bad to me - so I don't think there's anything we can do to make this better.