Bug 509115

Summary: Unreal Engine Blueprints right click search menu
Product: [Plasma] kwin Reporter: Znmop <mihai4games>
Component: generalAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED FIXED    
Severity: normal CC: kdedev, nate, s_chriscollins, xaver.hugl
Priority: NOR    
Version First Reported In: 6.4.4   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: https://invent.kde.org/plasma/kwin/-/commit/4dd843cc025fd1c6602cefd532b5c9566c77ff4a Version Fixed/Implemented In: 6.5.4
Sentry Crash Report:

Description Znmop 2025-09-04 17:17:26 UTC 
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.
Comment 1 TraceyC 2025-09-16 01:00:45 UTC 
Moving to kwin, which is responsible for UI windows
Comment 2 Zamundaaa 2025-09-16 15:37:05 UTC 
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.
Comment 3 Zamundaaa 2025-09-16 16:01:04 UTC 
Hmm, sorry, I was corrected, UE is still an X11 app. I can't explain the bug in that case though.
Comment 4 Nate Graham 2025-09-16 22:22:01 UTC 
Seems like it's still an app bug, no?
Comment 5 Zamundaaa 2025-09-22 12:14:25 UTC 
Could be, but we need more information to be sure.
Comment 6 Zamundaaa 2025-11-06 15:34:53 UTC 
*** Bug 511679 has been marked as a duplicate of this bug. ***
Comment 7 Bug Janitor Service 2025-11-06 16:15:39 UTC 
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/8377
Comment 8 Zamundaaa 2025-11-18 23:57:46 UTC 
Git commit 4dd843cc025fd1c6602cefd532b5c9566c77ff4a by Xaver Hugl.
Committed on 18/11/2025 at 23:13.
Pushed by zamundaaa into branch 'master'.

events: ignore XCB_FOCUS_OUT events by default

They cause problems with some applications that do questionable things with
override redirect windows. As the event is only needed for other questionable
application behavior (apps rejecting focus), and wlroots doesn't seem to need
it either, ignore the event entirely.

If any problems arise, KWIN_ENABLE_FOCUS_OUT=1 can be set to get the old
behavior back.

M  +10   -0    src/events.cpp

https://invent.kde.org/plasma/kwin/-/commit/4dd843cc025fd1c6602cefd532b5c9566c77ff4a