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According to test result on tryserver, the constructor may receive text frame, although I couldn't reproduce it with writing tests. Then, it'll return the text node as the mouse event target after dispatching a pointer event. However, mouse events need to be targeted to element node. Therefore, it's wrong to use the frame when `aTargetContent` is specified. Additionally, for the last resort, it should refer an inclusive ancestor element of the target frame content if `aTargetContent` is not specified and the event should be targeted to an element. Finally, there is another path to set non-element node in `PresShell::EventHandler::DispatchEventToDOM`. The path is not the cause of the reported case, but we should fix it too. Differential Revision: https://phabricator.services.mozilla.com/D222091 |
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