Make "Find in Files" searches ignore directories with .gdignore fil…

…es in them

This pull request fixes an issue where searches using the "Find in Files" function would include folders with `.gdignore` files in them. The editor is supposed to ignore directories with these files in them altogether.

(cherry picked from commit 658b152)

editor/find_in_files.cpp

@@ -235,6 +235,11 @@ void FindInFiles::_scan_dir(String path, PoolStringArray &out_folders) {
 		if (file == "")
 			break;
 
+		// If there is a .gdignore file in the directory, don't bother searching it
+		if (file == ".gdignore") {
+			break;
+		}
+
 		// Ignore special dirs (such as .git and .import)
 		if (file == "." || file == ".." || file.begins_with("."))
 			continue;