calixteman 50601d0341

Copy the backdrop for non-isolated groups with a soft mask ...

PR #21455 drew non-isolated blend-mode groups against their backdrop via a
direct path on the parent canvas, but a soft mask forces the group onto an
intermediate canvas instead. There the inner blend modes composited against
transparency, so e.g. a /Multiply highlight was painted opaquely over the
text behind it, hiding it.

Copy the backdrop into that intermediate canvas so the blends see the real
background. The copy is limited to groups that would otherwise have taken
the direct path (source-over, alpha 1, not knockout/gray) but were displaced
onto the intermediate canvas by the soft mask.

It fixes #21593.

2026-07-19 21:01:28 +02:00

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