Change description of "is windowed" for windowed fullscreen.
I thought that alt-tabbing out of the game was broken until I realised that I could set windowed fullscreen mode by just setting the windowed resolution to the full res of my primary monitor.
It might be better to instead have a switch named "Exclusive Fullscreen" that has the opposite state to the "Is windowed" switch, to make it clear that in "Fullscreen" mode you can't alt-tab out, and maybe even another switch called "Windowed Fullscreen" that automatically sets the window to the current desktop resolution of the primary monitor.
I imagine most users appreciate the ability to tab out of the game when necessary, and that exclusive fullscreen mode will have very few users. Even with 2 monitors, in fullscreen mode you can't tab to the other monitor because the game grabs mouse focus back after a few seconds.
The behaviour is the same in all renderers.
bstone v1.2.11 Windows 10 Pro x64 19043.1110 Intel Core i7-5820K CPU @ 3.30GHz NVIDIA GeForce GTX 980
I'm thinking about to ditch the fullscreen (exclusive) mode.
Fixed (#385).