A native unlayouted EditText control fits 20 characters by default.
Let Qt Quick Controls Android Style use the same metrics instead of
adjusting to the textual contents. This gives empty TextField,
SpinBox and ComboBox sensible implicit sizes instead of shrinking
them down to something unusable.

Change-Id: I3cd3948aa3d64daada9d0b7d773cebb6627263f6
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>

The API is not ideal, we don't want to lock this thing down like as it
is now. All styles implemented so far created CursorHandleStyle.qml and
SelectionHandleStyle.qml so perhaps that's the better way to go.

Furthermore, there's never going to be multiple occurrences of the
handle pairs, so it should be one shared instance. Thus, the relevant
style delegates probably shouldn't be sprinkled around various control
styles...

So, for now, the most pragmatic solution is to make the handles and
cursors internal since we don't have time to revamp it before 5.4.0.

Change-Id: Ib9fcc4a431bb510c8c55a760159f4d6a631554b3
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@theqtcompany.com>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

Change-Id: Ic33d645ba384697f761540e277507ad56617e2fb
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>

Note: Requires Android 3.0 (API level 11) or later.

Task-number: QTBUG-35081
Change-Id: Id7a4577a4d78c9474c9ccd7ae754e16fcac8f0e5
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Reviewed-by: Caroline Chao <caroline.chao@digia.com>