commit 06fbb04

Handle tcell error events by closing

This is namely useful when the terminal is closing: these events are
sent, and we should close when that happens (instead of panicking).

 1@@ -192,7 +192,9 @@ func (app *App) eventLoop() {
 2 				if ev.content == nil {
 3 					return
 4 				}
 5-				app.handleUIEvent(ev.content)
 6+				if !app.handleUIEvent(ev.content) {
 7+					return
 8+				}
 9 			} else {
10 				app.handleIRCEvent(ev.src, ev.content)
11 			}
12@@ -359,7 +361,7 @@ func (app *App) uiLoop() {
13 	}
14 }
15 
16-func (app *App) handleUIEvent(ev interface{}) {
17+func (app *App) handleUIEvent(ev interface{}) bool {
18 	switch ev := ev.(type) {
19 	case *tcell.EventResize:
20 		app.win.Resize()
21@@ -369,11 +371,15 @@ func (app *App) handleUIEvent(ev interface{}) {
22 		app.handleMouseEvent(ev)
23 	case *tcell.EventKey:
24 		app.handleKeyEvent(ev)
25+	case *tcell.EventError:
26+		// happens when the terminal is closing: in which case, exit
27+		return false
28 	case statusLine:
29 		app.addStatusLine(ev.netID, ev.line)
30 	default:
31 		panic("unreachable")
32 	}
33+	return true
34 }
35 
36 func (app *App) handleMouseEvent(ev *tcell.EventMouse) {