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When creating a double brush, while selecting the original brush as the second brush, and checking “size connect”, a feedback loop can be created as soon as you attempt to change the size of the brush. The brush size very quickly exceeds maximum.

This is logical, but amusing, since I have now learned to duplicate a brush instead of warping space and time to point it back at itself.
Maybe a warning dialogue should prevent this specific paradox.

Thanks

Not sure that understand. Don't enable double brush to the brush which already have a parent brush