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Oddly, `WSRunObject::InsertText()` returns `NS_OK` even when `HTMLEditor::InsertTextWithTransaction()` returns error. However, it fails if insertion point is not editable like `<noscript>` element. In such case, `aPointAfterInsertedString` isn't modified and its caller, `HTMLEditRules::WillInsertText()` keep handling inserting remaining text with non-positioned `EditorDOMPoint`. Therefore, at the next time, `WSRunObject` fails to do anything since it requires positioned `EditorDOMPoint`. For making uplift safer, this patch makes `WSRunObject::InsertText()` set `aPointAfterInsertedString` by itself when `HTMLEditor::InsertTextWithTransaction()` returns error. Differential Revision: https://phabricator.services.mozilla.com/D32131 --HG-- extra : moz-landing-system : lando