SymbolPane: improve tooltips for C tags #1636
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We implemented more informative tooltips for Vala symbols recently. This does the same for C tags (as far as the parser allows).
The parser does not provide start and end lines for the tags, only the line on which the tag name occurs. As C methods often have the type on the previous line, the start line is decremented for methods. It is necessary to use Markup.escape_text as some C symbol definitions contain markup characters.