Trying to add undo

src/text_editor/buffer.cpp

@@ -225,7 +225,7 @@ void MergeSort(int64_t Count, Edit *First, Edit *Temp) {
     }
 }
 
-void ApplyEdits(Buffer *buffer, Array<Edit> edits) {
+void _ApplyEdits(Buffer *buffer, Array<Edit> edits) {
     Scratch scratch((Arena *)buffer->allocator.object);
     Assert(buffer->data[0]);
     Assert(buffer->allocator.proc);