Paint tool aspect ratio slider does only adjust to integer values
GIMP version: 2.10.18 Operating System: Windows 7 Package: official installer from gimp.org
The Aspect Ratio slider (tool option for Paintbrush and similar tools) can be used to change a round brush to an elliptical brush (for example). However the slider is locked to integer values so unless you click the up/down arrows, it goes from 0 straight to 1, which changes 1:1 ratio to 1:2, which is a very large change. It skips past many useful values for an elliptical brush. Values greater than 4 (which take up most of the slider) result in a very elongated brush which is not very useful at all. Most of values that I usually want to choose are between 0 and 1 (I use Angle option of rotation so negative values are also useless to me).
In release notes (https://www.gimp.org/news/2020/02/24/gimp-2-10-18-released/) the new sliders interface is described as follows:
Left-click + drag changes a value with a default increment Shift + left-click + drag (or right-click + drag) changes a value with a smaller step Ctrl + left-click + drag change a value with a larger step
However all of these methods can only select integer values on this slider.
Possible solution: the scale is from -45 to 45, but the value is the angle arctan(r+1)-45° where r is the current aspect ratio value. This would allow to smoothly change the aspect ratio from ∞:1 to 1:∞