dornED

I encountered the same issue. Following this example https://github.com/matplotlib/matplotlib/issues/19405#issuecomment-770244923, I was able to resolve it with the following patch: ``` diff --git a/meld/diffgrid.py b/meld/diffgrid.py index c03e4ab7..05fab041 100644 --- a/meld/diffgrid.py +++...