Remove the sidebar resizing event listeners with an AbortController
#18593
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Use a few local variables in
PDFSidebar.#addEventListeners
This, ever so slightly, shortens the code for a couple of repeatedly accessed class fields.
Stop sidebar resizing on "blur" events
Because of an old oversight (by me) we don't stop sidebar resizing when the browser window loses focus, which seems generally wrong and can also lead to duplicate mouse-related event listeners being registered.
Remove the sidebar resizing event listeners with an
AbortController