Match highlighting in the main window about dact

[jelmervdl]

I've implemented it a bit, and it shows like a QLabel.

I not yet convinced it is an improvement. Selecting the text like in QLineEdit (or QLabel with the right flags) isn't possible, and we may need a scrollbar or word wrapping to make the complete sentence show.

I thought about using QLabel as a basis, but extending that one is quite hard, it uses some external classes to do the actual drawing and text selection. Using HTML could also have been a nice solution, but as far as I can tell QT 4.7 does not support a background-color attribute on the font element.

edit: reverted in 2863b3e

[jelmervdl]

Now we are using a QTextEdit for the bracketed sentence widget, we could use QTextEdit::setExtraSelections.

[danieldk]

This works now, but on OS X there is still some weirdness with submatches, where there is a darker (fully opaque?) vertical line at the start of a submatch. On Linux this doesn't seem to occur (at least via remote X).

Since this is not a show-stopper, I'll close this bug for now.