XSLT syntax highlighting / Bugs

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# Sort A -> Z Sort Z -> A	Summary▾ Sort A -> Z Sort Z -> A	Milestone▾ Sort A -> Z Sort Z -> A Filter by Milestone	Status▾ Sort A -> Z Sort Z -> A Filter by Status	Created▾ Sort A -> Z Sort Z -> A	Updated▾ Sort A -> Z Sort Z -> A
16	Improper highlight for C directives	1.x	open	2020-03-16	2020-03-16
15	Highlighting crashes on XML snippet	2.x	open	2019-09-30	2019-10-01
14	NPE on <programlisting>@<emphasis/>	1.x	open	2017-07-14	2017-07-14