Fix a [_ViewportElement] RenderObjectChild update bug #96377
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| // `moveRenderObjectChild` only happens during [update] stage. |
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Seems an invalid comment that's indicating the wrong method and didn't start with ///?
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Just comment that why not override moveRenderObjectChild
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Could it say it? It wasn't immediately clear for me either
For example
// We don't override `moveRenderObjectChild` here, because it only happens
// during [update] stage.
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Or: Do override moveRenderObjectChild, which just calls super and has an assert that _doingMountOrUpdate is true to show & proof that the comment is true.
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Or: Do override moveRenderObjectChild, which just calls super and has an assert that _doingMountOrUpdate is true to show & proof that the comment is true.
Done and add a test to test it.
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| // `moveRenderObjectChild` only happens during [update] stage. |
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Or: Do override moveRenderObjectChild, which just calls super and has an assert that _doingMountOrUpdate is true to show & proof that the comment is true.
Fixes #96024
Fixes #55170
Fixes #25861
The
RenderViewportkeep a child RO by 'center', it will be updated in [_ViewportElement.mount] or [Update].But sometimes the child RO will be changed without [_ViewportElement] change when only the subtree of
Viewportis dirty.In that case, we should also update the center RO.
Similar to the root cause of this issue, it has a similar solution.