Allow duplicating files when holding Control

(cherry picked from commit b426d11d8617daa79ccc5fa8c644abb8c8dfecd0)

editor/filesystem_dock.cpp

@@ -33,6 +33,7 @@
 #include "core/io/resource_loader.h"
 #include "core/os/dir_access.h"
 #include "core/os/file_access.h"
+#include "core/os/input.h"
 #include "core/os/keyboard.h"
 #include "core/os/os.h"
 #include "core/project_settings.h"
@@ -2059,7 +2060,32 @@ void FileSystemDock::drop_data_fw(const Point2 &p_point, const Variant &p_data,
 				}
 			}
 			if (!to_move.empty()) {
-				_move_operation_confirm(to_dir);
+				if (Input::get_singleton()->is_key_pressed(KEY_CONTROL)) {
+					for (int i = 0; i < to_move.size(); i++) {
+						String new_path;
+						String new_path_base;
+
+						if (to_move[i].is_file) {
+							new_path = to_dir.plus_file(to_move[i].path.get_file());
+							new_path_base = new_path.get_basename() + " (%d)." + new_path.get_extension();
+						} else {
+							Vector<String> path_split = to_move[i].path.split("/");
+							new_path = to_dir.plus_file(path_split[path_split.size() - 2]);
+							new_path_base = new_path + " (%d)";
+						}
+
+						int exist_counter = 1;
+						DirAccessRef da = DirAccess::create(DirAccess::ACCESS_RESOURCES);
+						while (da->file_exists(new_path) || da->dir_exists(new_path)) {
+							exist_counter++;
+							new_path = vformat(new_path_base, exist_counter);
+						}
+						_try_duplicate_item(to_move[i], new_path);
+					}
+					_rescan();
+				} else {
+					_move_operation_confirm(to_dir);
+				}
 			}
 		} else if (favorite) {
 			// Add the files from favorites.