[krita] [Bug 398689] Image disappears when zooming in after scale transform

[vanyossi]

https://bugs.kde.org/show_bug.cgi?id=398689

vanyossi <ghevan at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |CONFIRMED

--- Comment #27 from vanyossi <ghevan at gmail.com> ---
The canvas is not correctly updated when texture buffer is active. This happens
at least from this version up to 5.2.0 beta and master.

The issue before going with 16 buffers was a completely transparent (with small
images) or semi transparent images after a canvas operation and pan/move/paint
with bigger ones as shown in bug 398689. With the current code an the 16
buffers only some of them fail to update sometimes, leaving. a portion of the
image without redraw and showing the checkerboard as shown by bugs 459458,
452655 and 473806. If the image is small enough it can make the entire canvas
become transparent.

My current testings are using M! with master (e0fa60d68f) and 5.2.0beta

This is a display error, no data is lost and hiding/showing the a layer makes
the image redraw. I'll close all duplicates and use this bug as is the first
one to mention a problem with texture buffer with macOS (Nvidia and M1-2).

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