git: several hints and dialogs don't appear when using keyboard shortcut commit

[flurmbo]

• VSCode Version: 1.30.2, 1.31.0-insider
• OS Version: Ubuntu 18.04.1

Steps to Reproduce:

1. Open the source control panel in a project with git enabled
2. Click on the message text input and leave it blank.
3. Use the keyboard short to make a commit (on my machine Ctrl+Enter)
4. Notice that no message appears.
5. With the text input still empty, instead click the commit button (it looks like a checkmark).
6. A message saying something like "Please provide a commit message (Press 'Enter' to confirm or 'Escape' to cancel)" should appear.

A similar problem occurs when using the keyboard shortcut when trying to commit when there are no changes in the working tree ("There are no changes to commit" does not appear) and also when there are no staged changes to commit ("There are no staged changes to commit. Would you like to automatically staged all your changes and commit them directly?").

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

[vscodebot]

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

• Git: Support editing the commit message in a text editor (#30562)
• Git: All changes are Committed, even if some are unselected (#64029)
• Prevent accidentally staging or unstaging files when commit is in progress (#51721)
• Git: Automatically insert line breaks in git commit messages (#2718)
• Better Integration with Github Commit Messaging (#65493)