Fix ComposeViewport canvas overflow at fractional scales - #3389
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Oleksandr Karpovich (eymar) merged 1 commit intoSep 16, 2026
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Oleksandr Karpovich (eymar)
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September 7, 2026 09:50
Shagen Ogandzhanian (Schahen)
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Shagen Ogandzhanian (Schahen)
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Checked manually, failed to come up with better solution (tried flex and grid approaches)
Oleksandr Karpovich (eymar)
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September 16, 2026 07:10
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Description:
The generated positioning container and its nested containers did not establish a definite sizing chain. As a result, the canvas’s height: 100% could not always resolve against the viewport container, and its rendered CSS size could fall back to the intrinsic aspect ratio derived from the canvas.width and canvas.height backing-store attributes.
At fractional display scales, independently rounded backing-store dimensions could make the rendered canvas slightly taller than the viewport container, causing browser scrollbars.
Giving the positioning container and its nested containers explicit dimensions ensures that the canvas’s CSS bounds are determined by the viewport container and remain independent of its backing-store size.
Fixes https://youtrack.jetbrains.com/issue/CMP-10762/Scrollbar-appears-at-some-browser-zoom-levels (see the screenshot of the problem there)
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