perf: add signal to invalidate buffers without doing layout #5123
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I wanted to fix a bug in the 7TV fork related to paints and noticed that I needed a way to just invalidate the paint buffers but not do layout (if it's not needed).
This PR adds a signal similar to
layoutRequested
that tells channel-views to discard the paint buffers. This is done by setting a flag when doing (re-)layout.I noticed two settings that benefit from this: Alternate background color and Separate with lines. You can test this PR by toggling the settings.