[okular] [Bug 437334] Okular crashes in CursorWrapHelper::getScreen() when wrapping cursor on wayland

[Aleix Pol]

https://bugs.kde.org/show_bug.cgi?id=437334

--- Comment #3 from Aleix Pol <aleixpol at kde.org> ---
Here is some information. https://wayland-book.com/

In general terms, you need to understand that in Wayland you cannot move the
cursor. So in general this part should be just skipped on wayland.

The crash itself happens because it's unable to figure out the geometry of the
current display. This is something that won't just fly here and should be
avoided.

You might want to add a KWindowSystem::isPlatformWayland() that just does the
scrolling without moving the cursor.

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