[kwin] [Bug 382604] User needs to restart KWin to apply a new cursor theme to the whole system

[Patrick Silva]

https://bugs.kde.org/show_bug.cgi?id=382604

--- Comment #11 from Patrick Silva <bugseforuns at gmx.com> ---
Created attachment 125613
  --> https://bugs.kde.org/attachment.cgi?id=125613&action=edit
Cursors KCM on Wayland

Watch the following screen recording please.
https://www.youtube.com/watch?v=_EI4kxS63Ko

I change from red cursor theme to the yellow one.
Cursor is still in red when I hover over the following areas:
- wallpaper
- the header of Cursors kcm
- "hard disk i/o monitor", "network monitor" and "thermal monitor" widgets
- any part of "weather report" and "hard disk space usage" widgets but their
blue bars

Then I restart kwin and the cursor becomes correct (yellow) when I hover over
the areas mentioned above.

But newly started apps Dolphin and Kinfocenter are still showing the previous
red cursor when I hover over any part of them but their window decoration.

As we can see in my screen recording, restart kwin is not enough.
Relogin is the only way to apply another cursor theme to the whole system on
X11.

If it's hard to solve this ancient and annoying bug, I think that Cursor kcm
could definitely stop trying to apply the cursor theme without relogin and
adopt the same behavior that already occurs on Wayland. On Wayland, Cursors kcm
shows a warning saying that relogin is required for the cursor theme change to
take effect, as we can see in the attached screenshot.

Operating System: Arch Linux 
KDE Plasma Version: 5.17.90
KDE Frameworks Version: 5.66.0
Qt Version: 5.14.1

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