Two fields in the GC markers have before and after parts.  Update the
labels for these fields to include "(pre - post)" making the meaning
clearer.

…lopment (#1621)


Co-Authored-By: jankeromnes <jan.keromnes@typefox.io>

…e key (#1622)

This patch also adds more and better tests for the component ButtonWithPanel.

…Merge PR #1640)

…re applicaton

…re applicaton (Merge PR #1660)

We had a WebWorker named zeeWorker in global scope before and because of
that jest was hanging before with a following message: "Jest has detected
the following 1 open handle potentially keeping Jest from exiting."

Previously, it was opening the panel immediately after the URL
shortening happens. And it was generally before profile upload event.
That was causing some confusion for users since they were closing the
tab too early thinking that the upload process is complete after the URL.

…1688)

* Truncate markers with unknown end to get them drawn correctly (Fixes #1569)

* Show 'unknown' instead of 'n/a' in the marker table

* Add incomplete markers for MarkerChart snapshot test

* Fix typo in Marker test