keywords now don't include space-likes when matched (this is not visible in regular themes b.t.w. - and certainly not in those in use in the interpreter)
escaped quotes in strings now don't end strings anymore, so "a string with an escaped quote \" is now matched as a whole"
options c.s. are not matched anymore in msgenny
got rid of some unnnecessary complexity
added (fairly complete) CodeMirror style test suite
Also see PR 3523 in the codemirror/CodeMirror repo
Also see PR 3523 in the codemirror/CodeMirror repo