Having the bg colour as a fg colour in a cell causes it to become transparent

[leojweda]

OS: macOS.
Relevant config:
background-opacity = 0.96
window-colorspace = display-p3
theme = light:"iTerm2 Solarized Light",dark:"iTerm2 Solarized Dark"

I use the foreground colour as decoration in my prompt with the background being another colour. This causes the foreground character to become transparent. The half circle next to the timestamp in my case.

The issue:

The issue not being present when I set the background colour to be slightly different:

iTerm rendering said characters properly without the workaround:

Possible culprit:

ghostty/src/renderer/Metal.zig

Lines 2470 to 2502 in caddf59

	if (bg) |rgb| {
	// Determine our background alpha. If we have transparency configured
	// then this is dynamic depending on some situations. This is all
	// in an attempt to make transparency look the best for various
	// situations. See inline comments.
	const bg_alpha: u8 = bg_alpha: {
	const default: u8 = 255;
	if (self.config.background_opacity >= 1) break :bg_alpha default;
	// If we're selected, we do not apply background opacity
	if (selected) break :bg_alpha default;
	// If we're reversed, do not apply background opacity
	if (style.flags.inverse) break :bg_alpha default;
	// If we have a background and its not the default background
	// then we apply background opacity
	if (style.bg(cell, color_palette) != null and !rgb.eql(self.background_color orelse self.default_background_color)) {
	break :bg_alpha default;
	}
	// We apply background opacity.
	var bg_alpha: f64 = @floatFromInt(default);
	bg_alpha *= self.config.background_opacity;
	bg_alpha = @ceil(bg_alpha);
	break :bg_alpha @intFromFloat(bg_alpha);
	};
	self.cells.bgCell(y, x).* = .{
	rgb.r, rgb.g, rgb.b, bg_alpha,
	};
	}

Possibly related discussion: #3573