Use argument passed to OpenCmd without splitting (#3946)

"Split(args[0])" has been performed since "open" was added[1], but it
may had been left by accident. It's unlikely desired when using the
command prompt, and doesn't seem to have been added once to commands
such as "vsplit" [2] which were implemented days before.

[1]: 5825353f64
[2]: 541daf212e

internal/action/command.go

@@ -290,20 +290,8 @@ func (h *BufPane) PwdCmd(args []string) {
 // OpenCmd opens a new buffer with a given filename
 func (h *BufPane) OpenCmd(args []string) {
 	if len(args) > 0 {
-		filename := args[0]
-		// the filename might or might not be quoted, so unquote first then join the strings.
-		args, err := shellquote.Split(filename)
-		if err != nil {
-			InfoBar.Error("Error parsing args ", err)
-			return
-		}
-		if len(args) == 0 {
-			return
-		}
-		filename = strings.Join(args, " ")
-
 		open := func() {
-			b, err := buffer.NewBufferFromFile(filename, buffer.BTDefault)
+			b, err := buffer.NewBufferFromFile(args[0], buffer.BTDefault)
 			if err != nil {
 				InfoBar.Error(err)
 				return