The keyboard shortcut for the search box on the blue-ocean home page always steals the focus away from any parameter text entry fields when the user tries to enter a value containing a "t". 

To replicate:

1. Using Blue Ocean, create a build with the attached Jenkinsfile (or clone the project from https://github.com/zometer/blueocean-param-input-bug).
2. Once the build is created, go to the "Branches" page and favorite (star) the master branch. 
3. Go back to the Blue Ocean home page. 
4. Click the "Run" button for the build. 
5. Type any word with a "t" in the "Release Notes" field. Any time you type "t" in the parameter entry field, the focus will always switch the the search box. If you avoid the letter "t", the build will run normally.