[wp-trac] [WordPress Trac] #50446: Twenty Fifteen: Regression in updated sticky sidebar code

[WordPress Trac]

#50446: Twenty Fifteen: Regression in updated sticky sidebar code
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 Reporter:  mechter       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Themes        |    Version:  5.4.2
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Hi all,

 the behavior of the sticky scrollbar in the Twenty Fifteen default theme
 changed unexpectedly upon updating the theme to version 2.6.

 Steps to reproduce: Create a page where both the sidebar and the content
 are long enough (relative to the window height) to cause scrolling, the
 content being longer than the sidebar. Scroll down, past the point where
 the sidebar stops scrolling. Scroll back up.

 Behavior up to 2.5: The sidebar immediately starts scrolling up.

 Behavior in 2.6: The sidebar remains fixed until you scroll back up beyond
 the point where it initially stopped when scrolling down.

 The original behavior seems to allow for more efficient navigation, and
 since this change was not mentioned in the changelog for version 2.6, I
 believe this is a bug.

 This regression seems to have been introduced in #46308 and previously
 discussed in #37536. @DvanKooten, @whyisjake, please have a look?

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Ticket URL: <https://core.trac.wordpress.org/ticket/50446>
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