Clicking (or marquee-selecting) keyframes in the Timeline selected only
the keys. Their property and layer stayed unselected, so the Graph
Editor, which shows the selected properties or else the animated
properties of the selected layers, came up empty until the property
was selected separately. As in After Effects, the Timeline's key
selection now selects the keys' properties and layers too (Shift adds
to them). keys.select takes this as `selectProperties`; the Graph
Editor's own key clicks leave what it shows alone.
Test: a_key_clicked_in_the_timeline_shows_in_the_graph_editor
(ui_keyframes).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>