Auto-Generation for Default Avatar shows the same image (not variations)

[faisal-alvi]

#282 (comment):

While testing the downloaded zip locally, I noticed auto-generation of Gravatars for default avatar shows the same image (not variations) for all users when the "Local Avatars Only" setting is enabled. When disabled, we can see all users have different versions of auto-generated default avatars. This has been there since #96 and is not due to recent changes. And the cause of this is that the hardcoded URLs are set here, it should have been set only for simple_local_avatar default avatar (i.e. avatar from the Media library).