macOS: background bleeds/flicker when resizing splits, creating tabs

[mitchellh]

Discussion: #4182, #4181, #4180, #3508

I'm not sure what is causing this yet but it'd be great to nail this down and clean this up.

Screenshot.2024-12-31.at.04.40.20.AM.mp4

[andrewcrook]

I get this as well. the title bar and main window area resize at different rates.

[dmehala]

I suspect what we're observing is the latency between the surface redraw and the window resize with a transparent background. Since fa83140 the background is fully transparent and made this more noticeable for users with background-opacity = 1.

Here's a video, top is without fa83140 and bottom 1.01+f4a9b65f:

Screen.Recording.2025-01-05.at.21.36.57.mp4

Unfortunately, the solution isn't as simple as reverting fa83140, because the issue will persist when using background-opacity = 0.x.

[andrewcrook]

I find its not as bad having background-opacity < 1 like 0.9 than having it as 1.

It doesn’t get rid of the issue but I wonder if there could be or is an option to turn off redrawing during resizing and dragging?
Just have the overlay and redraw after such an action is completed?

I know this can be done on macOS via an OS wide setting, however, can it be done per app i.e Ghostty’s configuration?

Cannot unsee it now 🙁