Commit amend loses newlines in existing commit message

[mcintyre94]

• VSCode Version: 1.24.1
• OS Version: MacOS High Sierra (10.13.5)

Steps to Reproduce:

1. Have a repo where the last commit message had multiple lines, make any change
2. From source control, stage the change, and then click ... > commit all (amend) or commit staged (amend)
3. A single line editor appears, prefilled with the last commit message with newlines removed. It doesn't appear to support any way of having multiple lines.

Does this issue occur when all extensions are disabled?: Yes

I found a related issue #35182 where there was no default message, this was fixed in PR e0bf4eb - I assume this is where the bug was introduced.

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Commit (Amend) loses multiline format in commit message (#40295)
• Commit Amend destroys Signed-off-by (and potentially other fields) in commit message (#47224)
• Add amend checkbox to commit panel (#46994)
• Automatically insert line breaks in git commit messages (#2718)
• Git amend: Line break is removed (#45115)

[mcintyre94]

Oops, didn't look hard enough, dupe of #40295