RevBy:    TrustMe

Task-number: 253365
Reviewed-by: dt

Add a shutdown()-notification to MainWindow and
reset the context in it.

Task-number: 256386
Reviewed-by: con <qtc-committer@nokia.com>

Simplify the symbol group recursion to oblivion and make
it parametrizable with predicates to control recursion and
further processing. Most importantly, insert a parent item
BEFORE its child item (ignoring for now the fact that child recursion
might fail), making it possible to check and do magic on the parent,
disabling further handling by the symbol context. Dumper handling
can then kick in and handle pointed-to dumpeable items by inserting
fake dereferencing items.
Remove logic to detect already expanded items, just re-insert the
children if the handler asks for it.

there is no way it could happen

Details: I want to have a way to run individual build steps stand alone.
This is partly in preparation for that.

This looks like a relict from a much earlier version.

Task-Nr: 235965

For example when you typed Ctrl+l and find that you don't want to use
the goto line filter after all.

Acked-by: con <qtc-committer@nokia.com>

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.