fix(positioning): fix a case of looping

[Domainv]

Closes #5194
Closes #5231

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• read and followed the CONTRIBUTING.md guide.
• built and tested the changes locally.
• added/updated tests.
• added/updated API documentation.
• added/updated demos.

[codecov]

Codecov Report

Merging #5253 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #5253   +/-   ##
============================================
  Coverage        51.04%   51.04%           
============================================
  Files                3        3           
  Lines               96       96           
  Branches            17       17           
============================================
  Hits                49       49           
  Misses              37       37           
  Partials            10       10

---

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[codecov]

Codecov Report

Merging #5253 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #5253   +/-   ##
============================================
  Coverage        51.04%   51.04%           
============================================
  Files                3        3           
  Lines               96       96           
  Branches            17       17           
============================================
  Hits                49       49           
  Misses              37       37           
  Partials            10       10

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d5bc6f8...6974e64. Read the comment docs.

[ludmilanesvitiy]

Smoke tested dropdown with tooltips and buttons with tooltips, looks good.

[ABugajska]

I've updated my app to angular 9.0.1 with ngx-bootstrap5.3.4
Bug still occurs with datepickers.
Any ideas?