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For the main editor, the timeline starts at the left edge of the editor canvas. But for MidiCueEditor, we place a canvas-ified piano roll header on the left of the canvas, so the timeline starts at some position right of that. Note that this means that converting global canvas coordinates to timeline coordinates is no longer guaranteed to be a 1:1 transform (it will be for Editor, but in general for EditingContext).
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html