Steps to reproduce (in KDE 5.8.5): 1. System settings->Workspace design->Cursors, choose DMZ or Breeze cursor. 2. Open Mozilla Thunderbird or Google Chrome. 3. Move mouse cursor on the window(not on title bar). The cursor would switch to other theme, like Oxygen5 theme 4. If I deleted oxygen5-cursors, then the cursor would use Adwaita cursor theme when it's on these programs' window.
Neither Thunderbird, nor Chrome are KDE applications. Please report this issue directly to their respective bug trackers.
(In reply to Christoph Feck from comment #1) > Neither Thunderbird, nor Chrome are KDE applications. Please report this > issue directly to their respective bug trackers. "Cursors not correctly shown in non-KDE apps" is really not a KDE Plasma bug? I can't agree with that... ...
(In reply to Christoph Feck from comment #1) > Neither Thunderbird, nor Chrome are KDE applications. Please report this > issue directly to their respective bug trackers. Also for openSUSE 42.1 with KDE 5.5.5 there were no such problems.