[ui] [fix]: The focus on text components is now released on outside click

[nicolas-lambert-tc]

Description

Bug:

Clicking outside of a text component (a search filter in the example below), didn't release the focus.

Now the focus is stolen by the main.MouseArea component

Related PR

This is an other approach of the PR provided by @waaake: #2666
It avoid creating MouseArea on existing and future components.

Implementation Details

It uses the eventFilter to only catch the mousePress events and clear focus each time an item have a focus at this step.

/!\ Having a python condition on each event can be time consuming.
It uses the EventFilter and can have some performance cost, but because it directly filtered event by type() (not isinstance) , it should be imperceptible.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.15%. Comparing base (d5007c6) to head (6e35205).
Report is 49 commits behind head on develop.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2740   +/-   ##
========================================
  Coverage    77.14%   77.15%           
========================================
  Files           41       41           
  Lines         6165     6167    +2     
========================================
+ Hits          4756     4758    +2     
  Misses        1409     1409           

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[fabiencastan]

Problem on copy/paste