Make error messages a bit better.

Change-Id: I83b5852abfbb3437c03516bc4b36eff385ddb983
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
BlackBerry: Prevent superfluous removal of socket notifiers

File descriptors have always been removed from bps before adding them,
which lead to an annoying warning.
"QEventDispatcherUNIX::registerSocketNotifier()" needs to be called
after "ioEvents()" to prevent this.

Task-number: QTBUG-34536
Change-Id: If074ff7a6638fe234abc100c81d094e182de7537
Reviewed-by: Kevin Krammer <kevin.krammer@kdab.com>
Reviewed-by: Thomas McGuire <thomas.mcguire@kdab.com>
QLineEdit: Fix potential crash when removing the clear button.

Remove it from the side actions list.

Task-number: QTBUG-34315
Change-Id: I70063351193b504f8656e903896d155ac74f73a6
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Disable clear button in read-only QLineEdit.

Task-number: QTBUG-34315
Change-Id: I6c318879aee907c080e871a541da4ba5eadd71ed
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>