Custom brushes popup not fully visible when there are a lot of brushes

[dacap]

[...] working with custom brushes menu. It somehow linked to the UI w/multiply windows. When this option is ON, the pop-up panel with custom brushes appears, but I guess it is much smaller then used to be. If this option in OFF, there is no way to choose a brush, but the size of the elements looks correct.

Source: https://community.aseprite.org/t/aseprite-v1-2-30-and-v1-3-beta7/11466/2

There are plans to re-design the custom brushes dialog (e.g. adding a scrollbar), this might be a good opportunity to fix both issues at the same time.