zig-mode changes my font size

[eldritchconundrum]

I use text-scale-increase to change my font size.
But every time I save a zig file, my font size gets reset...

[joachimschmidt557]

Related: #49

The cause of this behaviour is that our current formatting code runs revert-buffer after running zig fmt to load the new file. That means that the text scale is reset after every save.