Do not loop infinitely if a span is larger than the layout extent

There is no point in searching through all cells to see if an item of
columnSpan 3 fits into a layout with 2 columns, since it won't ever
fit.
So instead we detect this case early and ignore the item for
inclusion.

Task-number: QTBUG-35778

Change-Id: I3f7963df17b05b3eb14ba0bae49e5a885d15b33b
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>
Add missing call to initResources needed for static linking

Task-number: QTBUG-35674

Change-Id: If0b995fc8a28adf949189138106a2a1e7bd16147
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>
ComboBox: Don't suggest auto-complete text if editText is empty

... for editable ComboBoxes, that is.

Change-Id: Ieda089f715e8252ae47bbbff647982f96ec5f797
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>
ComboBox: Allow setting currentIndex to -1 to clear selection

Task-number: QTBUG-35794
[ChangeLog][QtQuickControls]ComboBox: Allow setting currentIndex to -1 to clear selection

Change-Id: I034b061484ab095a9ec049fb3b35614b98bfb956
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>