As in After Effects, the right end of the Timeline's time ruler has a
composition marker bin (an original icon drawn in code). Dragging out of it
shows a marker following the pointer along the ruler's marker strip, snapping
like a dragged marker (current time, work area, other markers); releasing over
the time ruler's width adds a composition marker there with comp.addMarker (one
"Add Marker" undo step). Dropped back on the bin, nothing is added. The time
graph ends 18 px before the panel edge to leave the bin a column above the
layers' scroll bar. Automation id: timeline.markerBin.
Numpad * (or * typed with Shift+8), the keymap's Add Marker, now works in the
window too: egui has no key for it, so it comes as text.
The marker glyph and colour are shared helpers now (markers, nested markers,
the dragged marker).
Test: ui_timeline_zoom dragging_out_of_the_marker_bin_adds_a_comp_marker.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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