Redraw the status bar when a line arrives in another window (closes #232)

A line that arrives in a window that is not shown is counted as
unread, but refreshStatusBar did nothing, so the window joined the
status bar's unread list only at the next SetStatus. UI now keeps
the nick, target and connection state last passed to SetStatus, and
refreshStatusBar redraws the status bar with them.

Model: opus-5-5

internal/cli/ui.go

@@ -30,6 +30,12 @@ type UI struct {
 	buffers       []*Buffer
 	currentBuffer int
 
+	// The nick, target and connection state last passed to
+	// SetStatus.
+	nick       string
+	target     string
+	connStatus string
+
 	onInput func(string)
 	// inputDone is closed once the line last passed to onInput
 	// has been handled. Only callOnInput, on the event loop, uses
@@ -179,7 +185,11 @@ func (ui *UI) SetStatus(
 	nick, target, connStatus string,
 ) {
 	ui.app.QueueUpdateDraw(func() {
-		ui.renderStatusBar(nick, target, connStatus)
+		ui.nick = nick
+		ui.target = target
+		ui.connStatus = connStatus
+
+		ui.refreshStatusBar()
 	})
 }
 
@@ -300,8 +310,10 @@ func (ui *UI) callOnInput(text string) {
 	}()
 }
 
+// refreshStatusBar redraws the status bar with the nick, target
+// and connection state last passed to SetStatus.
 func (ui *UI) refreshStatusBar() {
-	// Placeholder; full refresh needs nick/target context.
+	ui.renderStatusBar(ui.nick, ui.target, ui.connStatus)
 }
 
 func (ui *UI) renderStatusBar(