desktop: Add Controls > Step Once
, for frame-by-frame stepping
#18500
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Fast-paced animations can be hard to investigate with the debug tools, as one needs to suspend the playback at exactly the right time.
To alleviate this, this PR adds the
Controls > Step Once
menu command (shortcut: Ctrl+Space), which allows advancing a suspended movie one frame at a time. Sounds are suppressed while stepping, to prevent unpleasant "sound bursts".