Strangely, the document's last sentence ended with a colon,
giving the impression there's missing text that should follow.
There is not.
Even more strange, it's _always_ ended with a colon,
ever since the file was converted from XML
(in commit
10cd539104af54f5d1d1e49618f5aa9d8ac42074).
BUT, the XML file it was converted _from_ ended that same sentence
with a period! I have no idea where the colon came from.
the others. They also are mutually exclusive, within a widget
where may be only one gesture group claiming a given sequence.
If another gesture group claims later that same sequence, the
-first group will deny the sequence:
+first group will deny the sequence.