Fix warning "QAbstractItemView::setRootIndex failed : index must
be from the currently set model".

QmlDesigner.statesEditor: thumbnail update at state removal moved to propertiesAboutToBeRemoved method

Disable the states editor widget if the qml file is invalid, just
as the other windows are disabled.

Task-number: BAUHAUS-272

Reviewed-by: thorbjorn

Reviewed-by: thorbjorn

Reviewed-by: thorbjorn

Reviewed-by: thorbjorn

Reviewed-by: thorbjorn

Fixed semantic check for ObjC fast-enumeration for-loops, then merged it with the semantic check for the foreach.

We have to use LinkAction instead of MoveAction
otherwise the model and the ItemView executes
the move/reparenting which turns the ItemModel
invalid and results in a crash

Reviewed-By: dt

 * Remove duplicate headers.
 * Move own headers to the top.

Reviewed-by: Roberto Raggi

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

This fixes the issue that when loading a project in a big session the
newly loaded project is hard to find. The solution is a bit of a hack.
Reviewed-by: mae <qt-info@nokia.com>

Reviewed-by: mae <qt-info@nokia.com>

On the project page