Created attachment 101812 [details] Arrow Cursor Inside Kate With compositing enabled, when a text editor is tiled by dragging to a screen edge, the cursor changes from `Qt::IBeamCursor` to `Qt::ArrowCursor` when it's near the center horizontally (and maybe in other places too). That not only makes it impossible to select/edit the text but also moves the window if the left mouse button is pressed. The text editor isn't important in this (the attached screenshot is about Kate). I can reproduce this issue both in KDE Plasma and in LXQt+kwin; so I think the problem is in kwin. The problem only occurs when the window is tiled, as far as I've seen.
More info: As soon as I resize a left/right tiled window (of a text editor) just a little, the problem disappears, even after I re-tile it. But when I close, open and tile it again, the problem appears exactly on the same horizontal line near the center.
Still more info: There is definitely a `QEvent::Leave` in QPlainTextEdit when the cursor reaches the horizontal middle line -- I tested with a text editor of mine.
That might be a problem I investigated this week: https://phabricator.kde.org/D3151 If you have a chance to test the patch and verify that it fixes the problem, that would be appreciated.
I confirm that the issue is fixed by https://phabricator.kde.org/D3151. Thank you very much!
Thanks for testing! I mark as duplicate to the original bug reported about the issue. Now I need to make sure that we get that into 5.8.3! *** This bug has been marked as a duplicate of bug 371284 ***