Each Increment spin box had a fixed maximum width of 55 px. The Windows
11 style puts the up and down arrows side by side, which leaves almost
nothing of 55 px for the number (#1566). The boxes now take the width
their style asks for.
Test: tst_autonumincrementwidth runs the editor under a style that
widens spin boxes the way the Windows 11 style does and checks each
Increment box is at least as wide as the style needs: 55 px against 81
px before this change.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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