Fix note polling

Closes #4032 (closed)

mentioned in issue #3530 (closed)

mentioned in issue #4033 (closed)

Reassigned to @DouweM

mentioned in merge request !2086 (merged)

Status changed to merged

mentioned in commit 9451db38

mentioned in commit 7c14541d

mentioned in commit 4493d3fd

Picked into 8-2-stable.

mentioned in commit 1322bd78

mentioned in commit ef14ec66

mentioned in commit c0a194fc

mentioned in commit 1e27b188

mentioned in commit b68450e2

mentioned in commit 4abf7ea5

mentioned in commit 9ae401cf

mentioned in commit be9f87f7

mentioned in commit nolith/gitlab-ce@ecbd9da8

mentioned in commit nolith/gitlab-ce@ed662aa6