NSComboBoxCell: completedString: returns nil on no match#484
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NSComboBoxCell: completedString: returns nil on no match#484DTW-Thalion wants to merge 1 commit into
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completedString: echoed the substring back when no item completed it; OS X returns nil. Return nil so callers can tell that there was no completion.
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-[NSComboBoxCell completedString:]returned the substring itself when noitem in the list completed it. OS X returns nil in that case, which is
how a caller distinguishes "no completion" from "the text is already a
complete item". Return nil when nothing matches. The two internal
callers already handle a nil result. Verified on a macOS runner:
completedString: for a non-matching prefix returns nil.
Adds a test for the no-match case.