dev: fix not being able to click on dead processes

cmd/sst/mosaic/multiplexer/multiplexer.go

@@ -156,7 +156,24 @@ func (s *Multiplexer) Start() {
 					}
 					if evt.Buttons()&tcell.ButtonPrimary != 0 {
 						x, y := evt.Position()
-						if x < SIDEBAR_WIDTH && y < len(s.processes) && !s.dragging {
+						if x < SIDEBAR_WIDTH && !s.dragging {
+							alive := 0
+							for _, p := range s.processes {
+								if !p.dead {
+									alive++
+								}
+							}
+							if alive != len(s.processes) {
+								if y == alive {
+									return
+								}
+								if y > alive {
+									y--
+								}
+							}
+							if y >= len(s.processes) {
+								return
+							}
 							s.selected = y
 							s.blur()
 							return