Mirroring repositories: paste `Git repository URL` with a middle click does not display `Detect host keys` and `Input host keys manually` buttons
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### Summary
No `Detect host keys` and `Input host keys manually` buttons appears when I cut & paste **with a middle click** a `ssh://` URL in `Git repository URL`.
If I hit a key, then the buttons appears.
A cut & paste **with Control + v** works.
It looks like the buttons only appears on keystrokes and not content changing.
### Steps to reproduce
1. Create a project
2. Got to `Settings` → `Repository`
3. Expand `Mirroring repositories`
4. Cut the following text `ssh://git@github.com/gitlabhq/gitlabhq.git`
4. Click **with the middle button of your mouse** in `Git repository URL` input box
### Example Project
### What is the current *bug* behavior?
The `Detect host keys` and `Input host keys manually` buttons are not displayed when I cut & paste **with a middle click** an URL.
### What is the expected *correct* behavior?
The `Detect host keys` and `Input host keys manually` buttons should be displayed when I cut & paste **with a middle click** an URL.
### Relevant logs and/or screenshots
#### GitLab does no display the buttons after pasting with middle click

#### When I hit the `a` key the buttons appears

### Output of checks
This bug happens on GitLab.com.
### Possible fixes
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issue