Add '..' to file listing

src/text_editor/plugin_directory_navigation.cpp

@@ -13,6 +13,7 @@ void InsertDirectoryNavigation(Buffer *buffer) {
     Scratch scratch;
     ResetBuffer(buffer);
     RawAppendf(buffer, "\n");
+    RawAppendf(buffer, "..\n");
     for (FileIter it = IterateFiles(scratch, buffer->name); IsValid(it); Advance(&it)) {
         RawAppendf(buffer, "%S\n", it.filename);
     }