Center numbers in Crop and Reduce Red Eye spinboxes
Summary:
When increasing the value displayed in a spinbox, normally the least
significant digit should stay in place to avoid unecessary movement.
This means the numbers should be right-aligned, instead of being
left-aligned like they are currently.
Since right-aligning still looks a bit unbalanced, centering should be a
good middle ground. In addition, when the number of digits does not
change it makes more sense to pad the number on both sides equally in
any case.
Test Plan:
Check that the spinboxes in the Crop and Reduce Red Eye
tools look more pleasant while resizing the crop rectangle and moving
the size slider respectively. For a more profound effect, use a large
image.
Reviewers: Gwenview, muhlenpfordt
Reviewed By: Gwenview, muhlenpfordt
Subscribers: muhlenpfordt
Tags: Gwenview
Differential Revision: https://phabricator.kde.org/D14954