Apply Qt::ControlModifier to all spin box interactions

A step modifier already existed when scrolling with the
Qt::ControlModifier held. This patch applies this functionality to
other methods of stepping a spin box.

Holding the modifier increases the step rate when:
- scrolling;
- pressing the up/down keys;
- pressing the spin box up/down buttons.

[ChangeLog][QtWidgets][QAbstractSpinBox] The Qt::ControlModifier
increases the number of steps a QAbstractSpinBox takes for the
following interactions: scrolling, up/down keyboard keys and the spin
box buttons. Previously, Qt::ControlModifier only affected scrolling.

Task-number: QTBUG-67380
Change-Id: Icc8754d5c007da0771bfaef113603a2f334dd494
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

0 files changed, 0 insertions, 0 deletions