There is an oddness in the search behavior that bites me every day. It seems to be related to the use of the Previous button, but I might have observed it under different circumstances. The following steps should illustrate it.

Reproducible: Always

Steps to Reproduce:
1. You are in the middle of some document. Open the search bar, type some text that matches the current document and hit enter.
2. Hit the Previous button to find the previous match.
3a. Append some text to the text in the search bar and hit enter. Nothing happens. Using the Previous and Next buttons continues to search for the old text.
3b. If instead of adding text as in 3a. you remove text from the text in the search bar, hitting enter doesn't have any effect either, but at least the Previous and Next buttons seem to look for the new text.
Actual Results:  
The search bar and the enter button are now in some broken state and one needs to fiddle about with the buttons and the enter key to be able to fully functionally search for new text.

Expected Results:  
After modifying the text in the search bar, hitting enter should search for the new text.