Height of input-group-text doesn´t match
### Summary
As you can see in the screenshot the height of the `input-group-text` (https://gitlab.com) does not match the height of the input. This behaviour can also be observed on other places on GitLab.com. Seems to be a general problem with the CSS class.
### Relevant logs and/or screenshots
**Firefox 66 (Windows):**

**Edge 44 (Windows):**

issue