Select autocompleted activity search text

[samdroid-apps]

This means that slow typers who are not looking at the screen will
will overwrite the autocomplete, instead of adding to it.

Thanks to @quozl for reporting and suggesting the solution.

[tchx84]

Hello @samdroid-apps , can you describe some use cases so I can test?

[samdroid-apps]

Try becoming a find an peck typer for a minute. So, type in the activity name slowly with 1 finger and looking at the keyboard. With the old version the user would end up with something like "Browsewse" in the search bar.

[quozl]

Yes, that's a good example. A tester should test with independent use cases as well, that's what I did to detect the problem. Perhaps tchx84 hasn't been able to review the patch quickly because the commit doesn't give an example of the problem. Hopefully that isn't needed.

[godiard]

Tested and is a good fix, specially thinking in our younger users. Merged.