Sam Atkins 4ffd43a5f4 HackStudio: Stop crash from leaking Editor widgets when closing tabs ...

When re-opening an existing file, we would reuse the document and
register a new Editor with it, but never unregister that Editor.

Previously, this would cause a crash if you opened a binary file, closed
its tab, then opened that binary file again. HackStudio would crash
while calling `HackStudio::EditorWrapper::update_title()` on an invalid
EditorWrapper. But now it doesn't!

Something still gets leaked each time, but we now don't crash at least.

2024-01-14 15:00:32 -07:00

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