I would like to be able to intercept double clicks on the text in an NSTextView even if the text is not a link and is not in an NSTextAttachmentCell. I did try to do this by implementing the textView: willChangeSelectionFromCharacterRange: toCharacterRange and comparing the initial and the proposed ranges and the time between the current call to this method and the previous one.
Can't you simply check if a double-click is in progress during the "willChange" method? Eg: [[[textView window] currentEvent] clickCount].
If not, subclass NSTextView and override mouseDown and you can check the click count of the NSEvent parameter directly.
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