[Libreoffice-bugs] [Bug 139296] scrolling document canvas down & up can cause a line of text to "tear" with loss of registration, it clears when the line moves out of view far enough or view passes to a new page

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=139296

--- Comment #40 from Telesto <telesto at surfxs.nl> ---
(In reply to spokanemagneto from comment #39)
It's likely in 4.3 too, have seen it happen on macOS. However never got a hold
on it.. but looks like GDI isn't affected.. so needs testing on Linux/macOS.

I speculate it can not be seen in 4.4.7.2 with OpenGL enabled because some
weird timer madness.. Timer logic changed with 4.4.7.2 - 5.1 branch. Causing
the issue to be more prominent.. but lingering around earlier on.

It appears mouse clicks are triggering a (full?) layout refresh or something
like that at some point.. With different offset of few pixels or even
rounding?? Where the backend holding a different image of the page (shifting)
compared to the 'paint buffer'. And clicking around triggers a paint buffer
invalidation/ repaint) Where the difference shows up and incrementally resolved
as screen refreshes in parts.. Leaving sometimes artifacts. 

But well that's my invented story of someone who has actually no knowledge the
matter.

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