Save some cycles by not using QTextBlock::text unnecessarily (since only
its length and the character at the block position were used).

This is to make it consistent with the rest of the settings ui.
When a checkbox is unchecked, the sub-check box becomes invalid, its
functionality is disabled, but it retains its checked state.

Merge-request: 1766
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 1766
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 1766
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 1766
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Based on the previous (referrable) line

Merge-request: 1766
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Separating navigation history logic from updating of highlights.

Merge-request: 1949
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Reviewed-by: Roberto Raggi

Universal helper kept around for comfort.

QString: Use QChar/char where appropriate, do not use QString::null

Regression in commit ab3d3cf4

Reviewed-by: Daniel Molkentin <daniel.molkentin@nokia.com>

Done with: Thorbjorn.

foreach()-Loops.

QString: Use QChar where appropriate.

doing it in 1.3 as well to avoid possible later conflicts

Yeah, now it looks as bad as the native completion widget :)
Reported by Nigel.

The smart backspace handling required a preceeding
non empty text block. In this case, the fix introduces
a standard backspace (deletePreviousCharacter).

Reviewed-by: dt

Better to draw it explicitly under the text, together with the
associated background color.

Depending on the XRender driver (probably), drawing a short straight
line can take quite a while when this line is transparent. On my
laptop's onboard ATI card, this meant that scrolling was unusably slow
when this transparent line was being drawn.

Fixed by avoiding the issue, since there is no actual need to use
transparency here. We can calculate the resulting color in advance
instead.

forwarding keys with empty text() does not restrict the matching items, but
updating the list of possible completions resets the currently selected item to
the first one

It was a bit confusing, since it reversed the order of the lines. When
this would be fixed, the added value of this action is very small, since
you can then also simply move your cursor one up before joining the
lines.

Merge-request: 1823
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 1823
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>
Task-number: QTCREATORBUG-510

Done with Thorbjorn and Roberto

done with roberto