Copy PR description to "Squash and Merge" commit message

When using the Squash and Merge feature in GitHub, I think would be really useful to copy the PR description and use that as the merge commit message.

Currently, if there are multiple commits in the branch then GitHub uses a list of the commit titles as the default merge commit message. My PR descriptions usually have more details than the commit titles, so I end up manually copying the description into the commit message field.

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#1264 touched on this, but also included changing the merge title. It seems like the negative feedback to that feature request was focused around changing the merge title, so I’m curious if people are supportive of a feature that only changes the commit message functionality.

[belm0]

I read through #1264, and I don’t understand the argument against copying PR description to commit message for squash-and-merge specifically.

Especially, the following comment seems to be focused on merge commits, and not considering squash-and-merge. For squash-and-merge, there is no “noise in the commit list”, and it’s essential to have a coherent commit message for posterity. @fregante

https://github.com/refined-github/refined-github/issues/1264#issuecomment-381915056

[mrcasals]

I agree with @belm0, could we have this feature? Maybe even have it disabled by default, if you think that’s too invasive, but for me it’s unexpected that only the PR title is copied. Thanks!