GUI: Parser-based highlighting

[dirkk]

The syntax highlighting goes wrong when there is a single " or ' present in the XML within the GUI editor. Obviously the editor expects a closing element, but this is not required by XML.

See attached screenshot:

[ChristianGruen]

In order to solve this, we have to advance from token highlighting to parser-based highlighting; otherwise, we’ll have no idea what’s currently being displayed. This is why I have changed the subject of this issue.

[ChristianGruen]

I merged this issue with #725...

When having overflowing text without breaks the editor hides the text using Linux (Fedora 19). I would expect either a scrollbar or automatic line breaks. See the attached screenshot for an example

[ChristianGruen]

Copied from #1426:

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I just stumbled over a minor bug in the editor. If you use the following query. It is somebit confusing, because the editor highlights (: not a comment :) as comment (cyan) but acutally it should be hightlighted as text (black).

let $x := <a>(: not a comment:)</a>
return $x