Shamim Rezaie 292a67aede MDL-68991 core: Prevent popup blockers blocking feedback window
Some browsers like Firefox are very inflexible with window.open()
and block it if it is not instantly invoked after the user click.

Also according to https://stackoverflow.com/a/6807615 it is best
practice to replace self:: with static::
2020-06-10 16:10:53 +10:00
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