While RMB was canceling, the check for Escape was overridden by the
modal keymap, causing Escape to confirm.
Resolve by:
- Removing Escape binding from the modal keymap, rely on hard coded
check as Escape to cancel is an assumption made in many places.
- Move RMB hard-coded check into the modal keymap since it's non-default
keymaps may use mouse buttons differently.
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