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Don't remount main split children on rhs collapse #4197
Merged
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This was super painful to diagnose, because of the tree depth where we end up rendering the children changing, react thinks that they are unrelated and thus remounts from scratch, do not change depth when conditionally rendering children in a component.
Fixes element-hq/element-web#9822
Signed-off-by: Michael Telatynski [email protected]