Add control for playback marker horizontal position #15617
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Implements control for adjusting the horizontal position of the playback marker/line over waveforms. - Adds [Waveform],PlayMarkerPosition control (0.0 = left, 1.0 = right) - Creates ControlPotmeter for smooth value adjustment - Exposes control in controller picker menu for MIDI/HID mapping - Adds tooltip for the control - Preserves existing playback marker position functionality Fixes mixxxdj#14288
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Description
Adds a controllable parameter for adjusting the horizontal position of the playback marker/line on waveforms, allowing users to customize where the playback position indicator appears.
Motivation
Users may prefer different playback marker positions for various workflows:
This addresses feature request #14288.
Changes
[Waveform],play_marker_positioncontrol (range: 0.0 = left, 1.0 = right)ControlPotmeterinWaveformWidgetFactoryfor smooth value adjustmentTechnical Implementation
The control is implemented as a global waveform setting that:
WaveformWidgetRendererTesting
Related Issue
Fixes #14288