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Don't assume that diffs will have an appropriate child node

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Fixes https://github.com/vector-im/riot-web/issues/11497

This is a regression from react-sdk v1.5.0 where the diff feature was added in the first place. It only affects lists.
This commit is contained in:
Travis Ralston 2019-11-27 12:26:43 -07:00
parent fbba55ab05
commit 673e6c3162
1 changed files with 2 additions and 0 deletions
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src/utils/MessageDiffUtils.js
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@ -77,6 +77,8 @@ function findRefNodes(root, route, isAddition) {
const end = isAddition ? route.length - 1 : route.length;
for (let i = 0; i < end; ++i) {
refParentNode = refNode;
// Lists don't have appropriate child nodes we can use.
if (!refNode.childNodes[route[i]]) continue;
refNode = refNode.childNodes[route[i]];
}
return {refNode, refParentNode};