A minor bug. It is in Pythonista 3 and also in the new beta 21100.
If you mark a text with "Highlight all" and the search line is available, the text is also copied to search line. That's great!
If you highlight a text and the search line is hidden, the test will not be there. I would appreciate, if the text will be available if I open the search line.
But now the bug. If you do this all the first time and the search text is in your search line, the search function (arrows) on right side of the search line are greyed out. The arrows will be avaiable, if you put an additional character to the search line.