SyntaxWarning: invalid escape sequence in fixTrailing regex #14

Claude reports:

boundkeys.py line 37 gives a SyntaxWarning on newer Python: re.compile("%s\s+%s" % ...) uses \s in a normal string (SyntaxWarning: "\s" is an invalid escape sequence, seen in the console on Sublime Text build 4215, Python 3.14). Writing it as r"%s\s+%s" should remove it with the pattern unchanged (I did not test that change). Only a warning for now; it becomes an error in a future Python.