Syntax colorisation broken by "special" comment

Adding a "special" comment consisting of a single exclamation point breaks the syntax parsing and colorisation of the lines following the use of such comment (including the line on which the comment is present).

• used variables are marked as unused (var1)
• attributes are not colorized as such (m_attr in the .cc file)
• the highlighting seems to be off by one line (the var3 is partially colorised)
• and many more.

Example attached.

(Useless note: I guess //! is treated as special in relation to doxygen comments parsing. Simply adding one character after the exclamation point, or removing the exclamation point, "fixes" the syntax colorisation).