When using the search in the message drawer and going back the input field focus is touching the search image.

My Proposal as to a fix seen in the attached images and under https://github.com/TobiGa/moodle/commit/9e0e5fe8df323b61aa049f2f8f58a1fbb4c7a609

https://github.com/moodle/moodle/compare/master...TobiGa:MDL-67660-master-v2

basically a removal of the reduced padding and adding a border as to signify the non clickable area.

basically adding a little padding.