terminal: prevent draw loop when unfocused

If a :term is open and aerc is focused on another tab, it is possible
for the :term to redraw itself to the screen.

Only allow terminal to redraw itself when it is focused.

Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
Acked-by: Robin Jarry <robin@jarry.cc>

widgets/terminal.go

@@ -178,6 +178,9 @@ func (term *Terminal) HandleEvent(ev tcell.Event) bool {
 	}
 	switch ev := ev.(type) {
 	case *views.EventWidgetContent:
+		if !term.focus {
+			return false
+		}
 		// Draw here for performance improvement. We call draw again in
 		// the main Draw, but tcell-term only draws dirty cells, so it
 		// won't be too much extra CPU there. Drawing there is needed