I am in the process of updating my book. When explaining some of the concepts with how layers interact with things like inherit alpha, it is harder to show what is going on with how small the layer thumbnails are.
This patch adds a slider to the layers docker by opacity that allows people to change the thumbnail size.
I also added a compressor to is so it doesn't update too often.
I struggled a bit for a good way to for the layout to refresh. I got something working with resizing that does the layout update, but maybe there is a better way to do it.
The setting also saves to the kritarc using the normal KisConfig path