[PATCH v10] Support auto-merge for meld to follow the vim-diff behavior

Hi Junio,

The [PATCH v11] is uploaded, it correct the misunderstanding in preview patch.
https://lore.kernel.org/git/pull.781.v11.git.git.1594106024078.gitgitgadget@gmail.com (local)

Please review again, thank you so much.

Regards
Lin