Wrong stash command being run (message prefixed with "--")

[glen-84]

Version: 1.31.1 (user setup)
Commit: 1b8e8302e405050205e69b59abb3559592bb9e60
Date: 2019-02-12T02:20:54.427Z
Electron: 3.1.2
Chrome: 66.0.3359.181
Node.js: 10.2.0
V8: 6.6.346.32
OS: Windows_NT x64 10.0.17763

Steps to Reproduce:

1. In the SCM view, use the Stash function (Git)
2. Notice in the Output window that the command run is git stash save -- myMessage instead of git stash save myMessage, which results in a message of -- myMessage.

Does this issue occur when all extensions are disabled?: Yes (tested with Insiders)

[vscodebot]

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

• Git: Support stashing before sync/pull (#15671)