regression: Dragging the VoIP popup too quickly selects text

[gabriellsh]

Proposed changes (including videos or screenshots)

Depending on system specs and usage, dragging the popup too quickly or to the edges of the screen triggers text selection. This can also cause the underlying elements to scroll due to the browser scrolling the content to match the selection position.

This was fixed by simply adding event.preventDefault when an user starts dragging the popup.

Also increased the automated tests to ensure this behaviour. Despite the simple fix, automating tests was not as trivial, but luckly it was possible to do.

Issue(s)

CORE-1169

Steps to test or reproduce

Further comments

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.60%. Comparing base (93eb903) to head (e30b579).
Report is 1 commits behind head on release-7.7.0.

Additional details and impacted files

@@                Coverage Diff                @@
##           release-7.7.0   #36084      +/-   ##
=================================================
- Coverage          64.20%   63.60%   -0.60%     
=================================================
  Files               3018     2922      -96     
  Lines              91839    90815    -1024     
  Branches           17433    17118     -315     
=================================================
- Hits               58967    57767    -1200     
- Misses             30185    30505     +320     
+ Partials            2687     2543     -144     

Flag	Coverage Δ
e2e	54.63% <ø> (-2.04%)	⬇️
unit	71.63% <0.00%> (+0.12%)	⬆️

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