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05bce4692d
`nsIEditor.setShouldTxnSetSelection` can preserve selection across multiple editing. Therefore, we cannot manage the state only in the stack. It's used only in comm-central, and used only with `insertNode` and `deleteNode`. Therefore, adding new param to them to preserve selection must be enough. While I'm writing this patch, I realized that `input` event is not fired by these methods because nobody set a placeholder transaction. That may lead Thunderbird only IME crash bugs due to `IMEContentObserver` is not notified editor properly. Therefore, this may fix some Thunderbird only crashes. Note that `deleteNode` should not update selection. However, I'm not 100% sure that. Therefore, I add new param to `deleteNode` too. However, some reviewers think it's unnecessary, I'll remove it before landing. Finally, `beforeinput` and `input` caused by the method calls start updating selection. However, I think that it should be better behavior. If Thunderbird needs to guarantee that selection is set to whether the user expected when it calls these methods with preserving selection. Differential Revision: https://phabricator.services.mozilla.com/D196004 |
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