Simplify sidebar styling.

src/Window.zig

@@ -1629,9 +1629,9 @@ fn applySidebarCollapsed(self: *Window, collapsed: bool) void {
 }
 
 /// One row's share of the collapse: everything but the emoji (or kind icon)
-/// goes. The status dot goes too — the bar down the row's leading edge and the
-/// wash behind it carry the state at this width, and they were designed to be
-/// the glanceable half of the pair anyway.
+/// goes. The status dot goes too — the bar down the row's leading edge carries
+/// the state at this width (with a wash behind it for the states that have one),
+/// and it was designed to be the glanceable half of the pair anyway.
 fn applyRowCollapsed(self: *Window, tab: *Tab) void {
     const shown: c_int = @intFromBool(!self.sidebar_collapsed);
     tab.label.as(gtk.Widget).setVisible(shown);