After commit c018f5fd29 Fenrir is being switched over to go. If you do not want to be part of the testing process, please switch to master.

internal/screen/attributes.go

@@ -0,0 +1,24 @@
+// Copyright (c) 2026 Storm Dragon
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package screen
+
+// Colors are RGB, tagged ANSI palette indices, or the terminal default.
+const (
+	ColorDefault uint32 = 1 << 31
+	ColorIndexed uint32 = 1 << 30
+	Bold         uint32 = 1
+	Underline    uint32 = 6 // libvterm retains single/double/curly underline.
+	Italic       uint32 = 8
+	Blink        uint32 = 16
+	Reverse      uint32 = 32
+	Strike       uint32 = 64
+	// VCSA high bit can mean blink, background intensity or a font bit. Keep
+	// it for change/highlight detection without claiming a specific style.
+	ConsoleHigh uint32 = 128
+)
+
+func (a Attribute) Default() bool {
+	return a.Style == 0 && (a.Foreground == ColorDefault || a.Foreground == ColorIndexed|7) &&
+		(a.Background == ColorDefault || a.Background == ColorIndexed)
+}