thin line when opacity and shadow enabled

[Faetu]

What Operating System(s) are you seeing this problem on?

macOS

Which Wayland compositor or X11 Window manager(s) are you using?

No response

WezTerm version

20240203-110809-5046fc22

Did you try the latest nightly build to see if the issue is better (or worse!) than your current version?

Yes, and I updated the version box above to show the version of the nightly that I tried

Describe the bug

When using opacity < 1.0 with "MACOS_FORCE_ENABLE_SHADOW" flag, there is a black thin frame:

This goes around the whole window.

To Reproduce

Set opacity below 1.0 and add the "MACOS_FORCE_ENABLE_SHADOW" decoration flag.

Configuration

-- Pull in the wezterm API
local wezterm = require("wezterm")

local config = wezterm.config_builder()

config.color_scheme = "Catppuccin Mocha"
config.front_end = "OpenGL"
config.bold_brightens_ansi_colors = true
config.hide_tab_bar_if_only_one_tab = true
config.tab_bar_at_bottom = true
config.default_prog = { "/opt/homebrew/bin/fish", "-l" }
config.window_decorations = "NONE | MACOS_FORCE_ENABLE_SHADOW"
config.window_background_opacity = 0.8
config.macos_window_background_blur = 90
config.max_fps = 120
config.use_fancy_tab_bar = false
config.notification_handling = "AlwaysShow"
config.animation_fps = 60
config.initial_rows = 45
config.initial_cols = 175
config.send_composed_key_when_left_alt_is_pressed = true
config.native_macos_fullscreen_mode = true
config.keys = {
	{
		key = "d",
		mods = "SUPER|SHIFT",
		action = wezterm.action.SplitHorizontal({ domain = "CurrentPaneDomain" }),
	},
	-- Send "CTRL-A" to the terminal when pressing CTRL-A, CTRL-A
	{
		key = "d",
		mods = "SUPER",
		action = wezterm.action.SplitVertical({ domain = "CurrentPaneDomain" }),
	},
	{
		key = "f",
		mods = "SUPER|CTRL",
		action = wezterm.action.ToggleFullScreen,
	},
	{
		key = "LeftArrow",
		mods = "SUPER|OPT",
		action = wezterm.action.AdjustPaneSize({ "Left", 5 }),
	},
	{
		key = "RightArrow",
		mods = "SUPER|OPT",
		action = wezterm.action.AdjustPaneSize({ "Right", 5 }),
	},
	{
		key = "UpArrow",
		mods = "SUPER|OPT",
		action = wezterm.action.AdjustPaneSize({ "Up", 5 }),
	},
	{
		key = "DownArrow",
		mods = "SUPER|OPT",
		action = wezterm.action.AdjustPaneSize({ "Down", 5 }),
	},
	{
		key = "LeftArrow",
		mods = "SUPER|CTRL",
		action = wezterm.action.ActivatePaneDirection("Left"),
	},
	{
		key = "RightArrow",
		mods = "SUPER|CTRL",
		action = wezterm.action.ActivatePaneDirection("Right"),
	},
	{
		key = "UpArrow",
		mods = "SUPER|CTRL",
		action = wezterm.action.ActivatePaneDirection("Up"),
	},
	{
		key = "DownArrow",
		mods = "SUPER|CTRL",
		action = wezterm.action.ActivatePaneDirection("Down"),
	},
}

return config

Expected Behavior

Expected was, not to have this thin line around the window.

Logs

Log is empty

Anything else?

No response

[Faetu]

I'm sry, I forgot to update the version to the nightly version I tried.
20240226-174525-22424c32

[RVZO6]

Experiencing similar behaviour