Fix unintended keyboard popup when navigating back to main screen

[hjiangsu]

Pull Request Description

This PR fixes an issue described in #1684 and #1110 where the keyboard would show up on the main pages after using search. I mainly tested this on an Android emulator as iOS doesn't seem to exhibit this issue (difficult to reproduce)

Note: this fix still keeps the old behaviour of double-tapping the search icon to open up the keyboard!

Issue Being Fixed

Issue Number: #1684, #1110

Screenshots / Recordings

Original Issue

original.mp4

Fixed Issue

fixed.mp4

Checklist

• If a new package was added, did you ensure it uses an appropriate license and is actively maintained?
• Did you use localized strings (and added appropriate descriptions) where applicable?
• Did you add semanticLabels where applicable for accessibility?

[micahmo]

LGTM!

BTW, to fully fix #1110, I believe we also need to minimize the keyboard when we navigate away from the search page in any way for example, as mentioned in that issue, clicking a search result. This behavior is a little annoying.

• Search for something (do not minimize keyboard)
• Click a result (keyboard automatically goes away)
• Go back
  • Keyboard automatically comes back :(

I believe there are some more scenarios mentioned in the bug. But that can be separate. I think this fully fixes #1684.

[hjiangsu]

I believe we also need to minimize the keyboard when we navigate away from the search page in any way

Ahh I see - this can definitely be fixed in a separate PR then as it's a bit more involved! I'll keep #1110 open until all the issues related to the Search page are resolved.