I just updated to macOS 26.1.
I have a pure AppKit app (I guess that's not possible anymore but as close to a pure AppKit app as you can get). I use NSButton with the glass bezel style and SF symbol images. It looks like the minor OS update brought layout changes because now some of these buttons are scaling the symbol image much larger than was being done on macOS 26. The image can sometimes draw outside the glass 'bezel'. It looks like using the 'info' symbol in a button results in much larger image scaling than it did on the previous Tahoe for some SF Symbols.
With the glass bezel style and a SF Symbol image how am I supposed to consistently make the button look good? With certain symbols I have to use imageScaling NSImageScaleProportionallyUpOrDown and on others I have to use NSImageScaleProportionallyDown. If I'm using a system image shouldn't it just do the right thing? Is trial and error the only way to tell? That's what I was doing before but it seems that the minor 26.1 update changed things.
Additionally calling -sizeToFit on a button multiple times can cause it to shrink for example:
[button sizeToFit]; // <-- At fitting size
// Then later
[button sizeToFit]; // Now button is shrunk
But if the button is already at its fitting size an additional call later shouldn't make it shrink, it should stay the same size. FB20517174
I see I now inherit SwiftUI, not sure if that has anything to do with this but if I wanted to opt in to fragile layout I wouldn't be using Appkit...