SUMMARY It's not possible to type inside the popup search window inside blueprints unless you give Legacy X11 App Support always permission. https://discuss.kde.org/t/enhancement-request-better-x11-keystroke-compatibility-for-professional-software/36825 https://forums.unrealengine.com/t/i-cannot-type-inside-the-blueprint-action-window/2078805 https://forums.unrealengine.com/t/unreal-engine-5-x-under-linux-search-in-blueprints-not-working/782597/4 https://forums.unrealengine.com/t/ue5-3-cannot-input-text-find-function-on-linux-wayland/1799561/5 STEPS TO REPRODUCE 1. Open any blueprint 2. Right click to open search menu 3. Type inside the window without relying on any gimmick that forces the popup window to gain focus OBSERVED RESULT Nothing gets typed in the search bar EXPECTED RESULT Letters/numbers appearing inside the menu SOFTWARE/OS VERSIONS Windows: macOS: (available in the Info Center app, or by running `kinfo` in a terminal window) Linux/KDE Plasma: KDE Plasma Version: 6.4.4 KDE Frameworks Version: 6.17.0 Qt Version: 6.9.2 ADDITIONAL INFORMATION Some users have found several gimmicks to circumvent this problem such as moving the cursor to the top left and then selecting the editor or right click inside the search box then left click to regain focus.
Moving to kwin, which is responsible for UI windows
Please report this issue to Unreal engine. As a Wayland native application, you're not supposed to use X11 for anything... especially not for input while the window in question is not focused.
Hmm, sorry, I was corrected, UE is still an X11 app. I can't explain the bug in that case though.
Seems like it's still an app bug, no?
Could be, but we need more information to be sure.