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When clicking it seems that the mouse isn't necessarily over the menu. Thus it
will open and close just after because the mouse isn't over the menu.

Fix #3987

Can we let watir guess what the browser is?

There was a deprecated warning because we tested the wait_until on
a variable that may change over time. The code has now be changed so that
the element is retrieved each time we test it.
Moreove the until() function may be useful elsewhere

The code didn't use shortcuts from VidjilBrowser.
Also the tests were calling set_browser each time which had
as en effect to start a new browser each time which had a strange
behaviour with the new Watir version.

Use latest Ruby version and Watir instead of watir-webdriver.
This will make it easier to install it on recent OS and it
will also allow us to test on recent Firefox versions.

Some changes in the syntax:
- visible? is deprecated → present?
- wait_until_* are deprecated → wait_until(&: *)
- some way of specifying timeouts

Watir also seems to be quicker thus the need to add
some waits or some sleeps

The previous IDs may have not been unique when having
several scatterplots at once.

We should just intantiate the browser in one place so that we can easily change it.
Moreover we benefit that to make it possible to change the browser path (FF).
This would enable testing several versions of the web browser.

This was becoming a mess

Due to the changes in axes management, there was some changes in the way stuff is displayed
in the HTML page.
Therefore the clone_info_segmenter also has to return the axisBox span (which didn't exist
before and whose content was in infoBox).
The productivity information can now be textually found in the title of the
span.

See #2412

The name makes more sense. Another function scatterplot will allow
to get the scatterplot itself.

This allows to reuse the main code, even with different IDs

It can also be a bar when the view is in histogram.
We select the one which is visible

We now have other information in the segmenter such as identity rate or productivity.
Thus we now return them.

system is in systemBox not nameBox

Access to tag selection (to hide or show tags)

Function to access graph legend (x axis) in the Vidjil browser (for
functional tests)

Function to access external data in the Vidjil browser (for functional
tests)

If it doesn't work by selecting the background we can do it by calling
the right method in the model.

$b.unselect was not working, we just comment it and do a workaround in some cases