Pressing ESC while "mouse1 drag" creating brush creates non-undo-able brush

[mfn]

ESC does it's regular behavior and de-selects any selection and thus also the still-to-be-created brush, however the brush is left in the scene without being able to be undone.

Suggestions: either make ESC a noop or cancel the brush creation entirely.

[AEonZR]

Never did this... so either way would be fine, focus being to keep it simple?