This PR makes several improvements to the behavior of arrows as they
relate to precision and container relationships.
- an arrow's terminals are always "true" and are never snapped to { x:
.5, y: .5 } as they were previously when not precise
- instead, a new `isPrecise` boolean is added to the arrow terminal
- when an arrow terminal renders "imprecisely" it will be placed to the
center of the bound shape
- when an arrow terminal renders "precisely" it will be placed at the
normalized location within the bound shape
The logic now is...
- if the user has indicated precision by "pausing" while drawing the
arrow, it will be precise
- otherwise...
- if both of an arrow's terminals are bound to the same shape, both will
be precise
- if a terminal is bound to a shape that contains the shape that its
opposite terminal is bound to, it will be precise
- if a terminal is bound to a shape that contains the shape that its
opposite terminal is bound to, it will be precise
- or else it will be imprecise
If the spatial relationships change, the precision may change as well.
Fixes https://github.com/tldraw/tldraw/issues/2204
Note: a previous version of this PR was based around ancestry but that's
not actually important.
### Change Type
- [x] `minor` — New feature
### Test Plan
1. Draw an arrow between a frame and its descendant
2. Draw an arrow inside of a shape to another shape contained within the
bounds of the big shape
3. Vis versa
4. Vis versa
- [x] Unit Tests
### Release Notes
- Improves the logic about when to draw "precise" arrows between the
center of bound shapes.
This PR adds support for multiple scribbles at the same time. It
prevents the sudden disappearance of existing scribbles when new ones
are added. It simplifies the management of scribbles by moving the
scribble manager to the editor.
### Change Type
- [x] `minor` — New feature
### Test Plan
1. Use the eraser, scribble select, and laser pointer tools
- [x] Unit Tests
### Release Notes
- [feature] multi scribbles
