Patch to improve the brush size keyboard shortcuts

[Dieki N <dieki.ubuntu@xxxxxxxxx>]

I've created a patch to improve the behavior of brush size increase\decrease keyboard shortcuts, particularly at small sizes and large sizes. The old behavior increased\decreased the brush size by a fixed value (0.10), which worked fine at medium sizes, and reasonably well at large sizes (since you could hold down the keyboard shortcut to get a lot of change), but completely broke down at sizes underneath 0.20, since you tended to have two options; too big or too small. (Or, when under 0.10, none at all!)

This patch sets the increment according to the following rules:

If <brush size> is greater than 2, it increments by 0.20.

If <brush size> is less than 2 but greater than 0.50, it increments by 0.10.

If <brush size> is less than 0.50 but greater than 0.10, it increments by 0.05.

If <brush size> is less than 0.10, it increments by 0.01.

I've tested this in my own use over the last couple weeks, and it seems most helpful, particularly when masking fine details. This patch is against Master.

Dieki

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