fix: the display of username suggestions

[ihor-romaniuk]

Reopened Pull Request based on #1270

Description

Username suggestions functionality has been corrected to ensure proper behaviour.

• fixed issue with suggestions being displayed in the wrong place;
• added the ability to navigate through suggestions using the keyboard.

Related Pull Requests

• PR to the open-release/redwood.master branch: fix: the display of username suggestions #1279
• PR to the open-release/quince.master branch: fix: the display of username suggestions #1278

Steps to Reproduce:

1. suggestions being displayed in the wrong place

Open register page -> Enter some string into field "Full name" (e.g. Jack Smith) -> Click on field "Public username"

suggestions_rendering_bug.mov

2. impossible to enter suggestions field using the keyboard

Open register page -> Enter some string into field "Full name" (e.g. Jack Smith) -> press Tab button until you get to the "Public username" field

suggestions_keyboard.mov

After changes:

1. suggestions being displayed in the wrong place

fixed_suggestions_rendering_bug.mov

2. impossible to enter suggestions field using the keyboard

fixed_suggestions_keyboard.mov

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.58%. Comparing base (a615cba) to head (9b834b2).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1584   +/-   ##
=======================================
  Coverage   87.58%   87.58%           
=======================================
  Files         124      124           
  Lines        2303     2304    +1     
  Branches      643      648    +5     
=======================================
+ Hits         2017     2018    +1     
  Misses        277      277           
  Partials        9        9           

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