462574 2022-12-03 08:43:11 +0000 On Wayland, window's doesn't become active when calling QWidget::activateWindow and QWidget::raise 2022-12-04 16:16:15 +0000 1 1 4 Plasma kwin wayland-generic 5.26.3 Debian testing Linux RESOLVED UPSTREAM NOR normal --- 0 m.weghorn kwin-bugs-null m.weghorn nicolas.fella 0 oldest_to_newest 2180781 0 154260 m.weghorn 2022-12-03 08:43:11 +0000 Created attachment 154260 Sample app to reproduce SUMMARY On X11, raising a window can be done by calling QWidget::activateWindow and QWidget::raise. However, that does not have the desired effect in a Plasma Wayland session. STEPS TO REPRODUCE 0. run a KDE Plasma Wayland session 1. compile attached sample program against Qt 6 2. run sample program 3. click the "raise other window button" in window "two" OBSERVED RESULT The window "one" is highlighted in the taskbar, but does not become the active window instead of window "two" EXPECTED RESULT Window "one" should become the active window, as is the case when run on X11. SOFTWARE/OS VERSIONS Debian testing with Qt 6.3.1 Linux/KDE Plasma: Operating System: Debian GNU/Linux KDE Plasma Version: 5.26.3 KDE Frameworks Version: 5.100.0 Qt Version: 5.15.6 Kernel Version: 6.0.0-5-amd64 (64-bit) Graphics Platform: Wayland Processors: 4 × Intel® Core™ i5-5300U CPU @ 2.30GHz Memory: 15.3 GiB of RAM Graphics Processor: Mesa Intel® HD Graphics 5500 Manufacturer: LENOVO Product Name: 20CJS11C00 System Version: ThinkPad T550 ADDITIONAL INFORMATION It works as expected when run with QT_QPA_PLATFORM=xcb, i.e. forcing use of Qt's xcb platform plugin. For Qt 5, this is not expected to work since QWindow::requestActivate isn't handled there on Qt side and I don't know whether the underlying problem(s) is in Qt or KWin or elsewhere. This issue was originally reported against LibreOffice, https://bugs.documentfoundation.org/show_bug.cgi?id=152205#c7 contains some more information on 2 scenarios that fail in different ways and might haver different root causes. (A LibreOffice scenario with gtk3 integration works on GNOME, but not KDE Plasma. The sample Qt app doesn't work in any of them, so there might be different issues.) 2181237 1 nicolas.fella 2022-12-04 16:16:15 +0000 In general for QWindow::requestActivate to work an activation token needs to be set. It can't just work in all cases. For the case where a window activates another window of the same app Qt can do that automatically since https://codereview.qt-project.org/c/qt/qtwayland/+/418094. That was added after Qt 6.3.1 though 154260 2022-12-03 08:43:11 +0000 2022-12-03 08:43:11 +0000 Sample app to reproduce main.cpp text/x-c++src 726 m.weghorn I2luY2x1ZGUgPFFBcHBsaWNhdGlvbj4KI2luY2x1ZGUgPFFQdXNoQnV0dG9uPgojaW5jbHVkZSA8 UU1haW5XaW5kb3c+CgpjbGFzcyBNeUJ1dHRvbiA6IHB1YmxpYyBRUHVzaEJ1dHRvbgp7CnB1Ymxp YzoKICAgIE15QnV0dG9uKFFNYWluV2luZG93KiB3aW4sIFFXaWRnZXQqIHBhcmVudCkKICAgICAg ICA6UVB1c2hCdXR0b24ocGFyZW50KSwKICAgICAgICB3aW5kb3cod2luKQogICAgewogICAgICAg IGNvbm5lY3QodGhpcywgJk15QnV0dG9uOjpwcmVzc2VkLCB0aGlzLCAmTXlCdXR0b246OnJhaXNl V2luZG93KTsKICAgIH0KCiAgICB2b2lkIHJhaXNlV2luZG93KCkgewogICAgICAgIHdpbmRvdy0+ YWN0aXZhdGVXaW5kb3coKTsKICAgICAgICB3aW5kb3ctPnJhaXNlKCk7CiAgICB9Cgpwcml2YXRl OgogICAgUU1haW5XaW5kb3cqIHdpbmRvdzsKfTsKCgppbnQgbWFpbihpbnQgYXJnYywgY2hhciAq YXJndltdKQp7CiAgICBRQXBwbGljYXRpb24gYShhcmdjLCBhcmd2KTsKICAgIFFNYWluV2luZG93 IHc7CiAgICB3LnNldFdpbmRvd1RpdGxlKCJvbmUiKTsKICAgIHcuc2hvdygpOwoKICAgIFFNYWlu V2luZG93IHcyKCZ3KTsKICAgIHcyLnNldFdpbmRvd1RpdGxlKCJ0d28iKTsKICAgIE15QnV0dG9u IGJ1dHRvbigmdywgJncyKTsKICAgIGJ1dHRvbi5zZXRUZXh0KCJSYWlzZSBvdGhlciB3aW5kb3ci KTsKICAgIHcyLnNob3coKTsKCiAgICByZXR1cm4gYS5leGVjKCk7Cn0K