This commit leaves two issues outstanding: 1. unclear/ugly semantics for drag operations that reset the GUI thread's tempo map to the writable copy 2. undo/redo for the tempo map These will be addressed in future commits
This commit leaves two issues outstanding: 1. unclear/ugly semantics for drag operations that reset the GUI thread's tempo map to the writable copy 2. undo/redo for the tempo map These will be addressed in future commits