Brush Preview
Operating System: any
Description of the feature
Many raster editors, especially pixel-art ones, give artist preview of how the brush would affect the image. That is especially useful for drawing straight lines (by holding shift) - you immediately see how their pixels will lay. Unfortunately GIMP currently (as of 2.10.8) gives only very generic preview, that has little to do with how actual line will be drawn with that brush, so artist has to try multiple times, until pixel perfect variation is achieved.
Use cases
Any precise pixel level editing.
Edited by Nikita Sadkov