MJML

Has anyone tried with the mjml plugin? I was giving this a shot and the blocks don't drag over but generate an "invalid target position" error.

Start by reproducing the MJML plugin integration in the GrapesJS React wrapper and capture the “invalid target position” error when dragging blocks. Trace the drag-and-drop behavior from the wrapper entry point and compare it with the plugin’s expectations. Done means MJML blocks can be dragged into the editor without the error, with a regression test covering the failure.

Written by the indexing model from the issue text.