Code animation: Timeline with keyboard & mouse events

This is integration of the following experiments:

• #124 Context menu
• #162 Copy & paste
• #163 Insert, cut, & delete

Code

https://svelte.dev/repl/430d56488ba54aa5b30a32fdbf2f881b?version=3.37.0

Demo

Notes

• Need placement engine for context menu. Can’t assume there is enough place for it below mouse position.
• Should not be able to insert an overlapping item. The item should be sized to fit, or denied if the insertion point is directly over of an element.