There was a previous fix that had to do with the brush editor settings. That fixed caused the layer blending mode options to not have its favorite checkbox clickable.

They share the same control so that was the reason. This patch should fix that by re-adding the hack that was done to override and force new events.

I tested the following areas:

1. Brush settings and changing an area doesn't make the brush preset dirty
2. Checked the blending mode area in the brush settings to make sure you could change the blending mode and add/remove favorites
3. Checked the paintopbox painting blending mode. Select different blend modes and add/remove favorites
4. Checked the layer docker blending mode drop down. Select different blend modes and add/remove favorites.

It all appears to work ok after this path.