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f938f62e31
Instead of calculating the hash of the buffer every time Modified() is called, do that every time b.isModified is updated (i.e. every time the buffer is modified) and set b.isModified value accordingly. This change means that the hash will be recalculated every time the user types or deletes a character. But that is what already happens anyway, since inserting or deleting characters triggers redrawing the display, in particular redrawing the status line, which triggers Modified() in order to show the up-to-date modified/unmodified status in the status line. And with this change, we will be able to check this status more than once during a single "handle event & redraw" cycle, while still recalculating the hash only once.