To avoid neverending line edits, make it look more compact.

Makes context sensitive help work for valid expressions that happen to
be part of a marked diagnostic error. However, for now you still can't
get documentation for expressions that don't resolve.

Also, context sensitive help now also works for includes where possible.

(user request)

By splitting out the confirmation to a different slot, so that the
dialog can be window-modal.

Also changed from Yes/No button to Cancel/Delete button, which is
clearer to the user.

Reviewed-by: Norwegian Rock Cat

case-insensitive search capatibilities (the default). Slower but
fits better with the other editors.

still needs porting)

If we are going to be uncertain, then let's try to
be somewhat better stylistically about it.

Reviewed-by: Thorbjørn Lindeijer

It was trying to build the ProjectExplorer before the Welcome mode,
and failing.

Reviewed-by: Thorbjørn Lindeijer

Reviewed-By: dt

Reviewed-By: TrustMe

This happens for example when removing a split editor.

The margin on the other panels is being set to 4, while the search panel
used the default margin.

Reminded by con.

qmake ensures that the file name ends with .prf, so there is no point if
we try it without first.

this should be marginally faster and it allows turning a few members
into locals.

and as that happens to be the only syntax error we can get during the
parsing stage, remove the fatal error handling alltogether.

Suggested by dt.

Reviewed-by: Thorbjørn Lindeijer