[Webkit-unassigned] [Bug 231163] New: Enabled GPU Process: Canvas Rendering feature leads to strange resize behaviour

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231163

            Bug ID: 231163
           Summary: Enabled GPU Process: Canvas Rendering feature leads to
                    strange resize behaviour
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: timocov at gmail.com
                CC: dino at apple.com

Created attachment 440045

  --> https://bugs.webkit.org/attachment.cgi?id=440045&action=review

repro

The strange behaviour we found with enabled "GPU Process: Canvas Rendering" experimental feature (see attached gif). If you disable this feature everything is fine.

To reproduce it you can do the following (see attached video):

1. Go to https://charting-library.tradingview.com/
2. Click on Indicators button in the header
3. Select "Accumulation/Distribution" there
4. Close the dialog and try to resize panes by dragging a handle between panes

=> When you resize a pane the top right canvas is cleared (the first price axis) for some reason, the right bottom canvas is fine even it is resized as well (the second price axis). If you disable "GPU Process: Canvas Rendering" feature then everything is fine with this.

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