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Dmitry Kazakov authored
The problem happened because openGL textures were painted without a full update. Basically, we shouldn't switch a texture tile from LodN to Lod0 mode with a partial update, because some part of the tile still has an old data, causing that weird flickering. So now we just issue *all* the GUI updates signals in one go, which basically updates all the tiles and then paints them on screen. See a comment in KisSuspendProjectionUpdatesStrokeStrategy. Fixes T2145 BUG:361448
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