Use default bg color when fg is set to -1 with reverse attribute

src/tui/tui.go

@@ -554,6 +554,9 @@ func initTheme(theme *ColorTheme, baseTheme *ColorTheme, forceBlack bool) {
 
 func initPalette(theme *ColorTheme) {
 	pair := func(fg, bg ColorAttr) ColorPair {
+		if fg.Color == colDefault && (fg.Attr&Reverse) > 0 {
+			bg.Color = colDefault
+		}
 		return ColorPair{fg.Color, bg.Color, fg.Attr}
 	}
 	blank := theme.Fg