Add 'insert' key for --bind

Close #1744

src/options.go

@@ -472,6 +472,8 @@ func parseKeyChords(str string, message string) map[int]string {
 			chord = tui.Home
 		case "end":
 			chord = tui.End
+		case "insert":
+			chord = tui.Insert
 		case "pgup", "page-up":
 			chord = tui.PgUp
 		case "pgdn", "page-down":

src/tui/light.go

@@ -453,7 +453,10 @@ func (r *LightRenderer) escSequence(sz *int) Event {
 			*sz = 4
 			switch r.buffer[2] {
 			case 50:
-				if len(r.buffer) == 5 && r.buffer[4] == 126 {
+				if r.buffer[3] == 126 {
+					return Event{Insert, 0, nil}
+				}
+				if len(r.buffer) > 4 && r.buffer[4] == 126 {
 					*sz = 5
 					switch r.buffer[3] {
 					case 48:

src/tui/tcell.go

@@ -318,6 +318,8 @@ func (r *FullscreenRenderer) GetChar() Event {
 			}
 			return Event{Right, 0, nil}
 
+		case tcell.KeyInsert:
+			return Event{Insert, 0, nil}
 		case tcell.KeyHome:
 			return Event{Home, 0, nil}
 		case tcell.KeyDelete:

src/tui/tui.go

@@ -66,6 +66,7 @@ const (
 	Right
 	Home
 	End
+	Insert
 
 	SUp
 	SDown