Files.app: Move lines related with the file type drop down list to DialogActionController.

ui/file_manager/file_manager/foreground/js/ui/dialog_footer.js

Index: ui/file_manager/file_manager/foreground/js/ui/dialog_footer.js
diff --git a/ui/file_manager/file_manager/foreground/js/ui/dialog_footer.js b/ui/file_manager/file_manager/foreground/js/ui/dialog_footer.js
index 2eda3fc509b66d0490632c8ca0b58ea9912d23ae..8583f4c672056d7561fbf429c8d0bc5799fa25f9 100644
--- a/ui/file_manager/file_manager/foreground/js/ui/dialog_footer.js
+++ b/ui/file_manager/file_manager/foreground/js/ui/dialog_footer.js
@@ -168,3 +168,15 @@ DialogFooter.prototype.initFileTypeFilter = function(
     this.fileTypeSelector.hidden = false;
   }
 };
+
+DialogFooter.prototype.selectTargetNameInFilenameInput = function() {
+  var input = this.filenameInput;
+  input.focus();
+  var selectionEnd = input.value.lastIndexOf('.');
+  if (selectionEnd == -1) {
+    input.select();
+  } else {
+    input.selectionStart = 0;
+    input.selectionEnd = selectionEnd;
+  }
+};