The crash range makes sense because caching is only enabled on nightly (and was briefly enabled on beta). Jamie, my theory is that `TextRange::CommonParent` is getting null when (retrieving a cached `GetChildAtOffset`)[https://searchfox.org/mozilla-central/source/accessible/base/TextRange.cpp#192], and then `CommonParent` crashes because it de-references aAcc1 when trying to get a parent. Is there a state (specifically in the context of recieving a text selection changed event) when the offset cache/hierarchy cache might be out of sync? If nothing comes to mind, I can just paper over it in `TextRange::CommonParent`.
Bug 1781169 Comment 2 Edit History
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The crash range makes sense because caching is only enabled on nightly (and was briefly enabled on beta). Jamie, my theory is that `TextRange::CommonParent` is getting null when [retrieving a cached `GetChildAtOffset`](https://searchfox.org/mozilla-central/source/accessible/base/TextRange.cpp#192), and then `CommonParent` crashes because it de-references aAcc1 when trying to get a parent. Is there a state (specifically in the context of recieving a text selection changed event) when the offset cache/hierarchy cache might be out of sync? If nothing comes to mind, I can just paper over it in `TextRange::CommonParent`.