Relating to the link in my last comment, the email at which it points appears to be from a GNOME bugzilla report - https://bugzilla.gnome.org/show_bug.cgi?id=689162 - regarding the issue, but that seems to be marked as a duplicate of https://bugzilla.gnome.org/show_bug.cgi?id=662728 which appears to have been closed with the conclusion that the root cause seems to be "some misbehaviour" in overlay-scrollbar.
Relating to the link in my last comment, the email at which it points appears to be from a GNOME bugzilla report - https:/ /bugzilla. gnome.org/ show_bug. cgi?id= 689162 - regarding the issue, but that seems to be marked as a duplicate of https:/ /bugzilla. gnome.org/ show_bug. cgi?id= 662728 which appears to have been closed with the conclusion that the root cause seems to be "some misbehaviour" in overlay-scrollbar.