Bad idea to hardcode the background color. Now using the style directly
to draw a fake tooltip as background for the function argument hint.

Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@nokia.com>

This will result in a speedup.

...making engine implementations easier.
Acked-by: hjk <qtc-committer@nokia.com>

Provide a checkable message box to be able to turn
prompting off when asked.

As requested on irc, and another common IDE has it at the same place. I
wonder whether we should have more options in that context menu. I
mainly put this in, because we don't have a good way to copy that full
path and I don't see a particular nice way to add it. Though I dislike
that it is only available in the context menu.

In it: Close Editor, Close Other Editors except me, Close All Editors.

Task-Nr: 256275

We are after all a text editor on steroids. That is people might want to
edit text files that don't have a ending we know.

Simply do it.

Task-Nr: 254558

It was only used for the watch-QImage-while-it-is-being-drawn-on feature,
which does not seem overly useful.

Each calls to fetchMore() was triggering an updateWatchData, and that
can happen several times per user interaction.