make macos_titlebar_color=background support transparent - #8906

2025-08-16 22:09:35.633 kitty[38828:29026832] NSWindow warning: adding an unknown subview: <NSView: 0x1245ae8d0>. Break on NSLog to debug.

This will have a warning, maybe we should find a better way to implement it

edit: fixed

And when background_opacity is set to 0.2, the titlebar background color is inconsistent compared to when it is set to 1.0 after maximizing the kitty window. in kitty 0.42.2 and master.

with -o background_opacity=0.55 -o background_blur=20 -o macos_titlebar_color=background

I dont have time to look at it today but till I do, some questions:

1. Does it work when resizing the window?
2. What about fullscreen and back, with macos_traditional_fullscreen set to yes and no
3. What happens if hide_window_decorations is set to yes, titlebar-only, titlebar-and-corners

Also, what happens if macos_titlebar_color is system and background_opacity < 1?

1. Does it work when resizing the window?

It works.

But the title bar has a slight color difference, and the window background does not follow the background color when it is scaled, and is consistent with the background color after the scale is completed.
with -o background_opacity=1.0 -o background_blur=0 -o macos_titlebar_color=background and macos_titlebar_color system/light/dark

2. What about fullscreen and back, with macos_traditional_fullscreen set to yes and no

all work(like kitty 0.42.2 release)

3. What happens if hide_window_decorations is set to yes, titlebar-only, titlebar-and-corners

all work(like kitty 0.42.2 release)

Also, what happens if macos_titlebar_color is system and background_opacity < 1?

like kitty 0.42.2 release

But the title bar has a slight color difference, and the window background does not follow the background color when it is scaled, and is consistent with the background color after the scale is completed. with -o background_opacity=1.0 -o background_blur=0 -o macos_titlebar_color=background and macos_titlebar_color system/light/dark

The reason has not yet been discovered

and the window background does not follow the background color when it is scaled, and is consistent with the background color after the scale is completed

Building the master branch also produces the same issue, so this PR didn’t introduce it.

and the window background does not follow the background color when it is scaled, and is consistent with the background color after the scale is completed

Building the master branch also produces the same issue, so this PR didn’t introduce it.

but not in kitty 0.42.2 release.

kitty -o background_opacity=1.0 -o background_blur=0 -o macos_titlebar_color=background

I remember that when setting hide_window_decorations=titlebar-only, the titlebar was hidden but the traffic light buttons were still visible. However, now they no longer appear, though I’m not sure if I’m misremembering. The issue occurred before this PR was merged—I forgot to mention that earlier.

5662d04

Perfect fix.

As long as it is not happening now, good enough :)

No, I didn't make it clear. This pr did not introduce this problem. It now exists in master.

I dont follow. I ran on current master

kitty --config=NONE -o hide_window_decorations=titlebar-only

and I see no titlebar and no traffic light buttons. Is that not correct?

If this is what is expected, it is absolutely correct.

Something went wrong with my memory🥲