Summary
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When the prev/next month button is clicked faster than the animation on the Digital Clock applet, the calendar will go forward/backward by fewer months than expected.

Steps to reproduce
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1. Click the digital clock applet to show the calendar.
2. Click next month twice in quick succession.

For easier observation, set animation speed in `Workspace > General Behavior` to slowest.

Observed result
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The animation immediately restarts from the month before clicking the button. After the animation ends, the calendar only goes forward by one month.

Expected result
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The calendar should go forward by two months.


Software/OS versions
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Linux: openSUSE Tumbleweed, kernel 6.7.7-1-default
KDE Plasma Version: 6.0.80
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2