add 'load' command to load modified dirs and files

complete.go

@@ -34,6 +34,7 @@ var (
 		"clear",
 		"draw",
 		"redraw",
+		"load",
 		"reload",
 		"read",
 		"shell",

doc.go

@@ -45,6 +45,7 @@ The following commands are provided by lf with default keybindings:
 The following commands are provided by lf without default keybindings:
 
     draw    draw the ui
+    load    load modified files and directories
     sync    synchronizes yanked/deleted files with server
     echo    prints its arguments to the message line
     cd      changes working directory to its argument

docstring.go

@@ -49,6 +49,7 @@ The following commands are provided by lf with default keybindings:
 The following commands are provided by lf without default keybindings:
 
     draw    draw the ui
+    load    load modified files and directories
     sync    synchronizes yanked/deleted files with server
     echo    prints its arguments to the message line
     cd      changes working directory to its argument

eval.go

@@ -390,9 +390,9 @@ func (e *callExpr) eval(app *app, args []string) {
 		app.ui.sync()
 		app.ui.renew()
 		app.nav.height = app.ui.wins[0].h
+	case "load":
+		app.nav.renew()
 	case "reload":
-		app.ui.sync()
-		app.ui.renew()
 		app.nav.reload()
 	case "read":
 		app.ui.cmdPrefix = ":"