NVDA behaves differently depending if the user is hovering or focusing an added signature.
An aria-description is read in both cases while an aria-label is not.
This integration test fails intermittently because of concurrent
clipboard access due to running the test in parallel in both browsers.
It can be reproduced by introducing `await waitForTimeout(1000)` between
the copy and paste operations.
This commit fixes the issue by running the test sequentially instead,
mirroring the change from commit 0e94f2bd.
Having some interactive elements forces the screen readers to switch to form mode
and consequently they delegate the keyboard stuff to the browser.
This patch sets an aria label on each editor in order to have a better description than just
'application'.
The idea is to avoid to have the pasted editor hidding the copied one:
the user could think that nothing happened.
So the top-left corner of the pasted one is moved to the bottom-right corner of the copied one.
This patch fixes an issue when pasting: an exception was thrown when pasting.
And while writing the test and comparing the paths in the svg, I found a difference
which is fixed thanks to call to the right constructor (to take into account the inheritance)
in inkdraw.js
