[wp-trac] [WordPress Trac] #29561: In Firefox, scroll bar jumps to beginning/end of editor upon page up/down when focused

[WordPress Trac]

#29561: In Firefox, scroll bar jumps to beginning/end of editor upon page up/down
when focused
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 Reporter:  AmbushCommander  |       Owner:
     Type:  defect (bug)     |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Editor           |     Version:  4.0
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:  ui
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Comment (by AmbushCommander):

 More testing on a fresh Wordpress install reveals that this behavior only
 occurs if you are using the text editor (not the visual editor). On the
 visual editor, there is a different bug: if I select in the visual editor,
 and then press page down, it does scroll down, but the cursor position
 does not change. The behavior is indifferent to whether or not you are in
 two-pane or one-pane mode.

 Actually, playing around with the screen options, I have a hypothesis for
 what is happening: in order to implement infinite scroll, Wordpress
 currently configures the text editor box with a ludicrously large height.
 It appears to be the case that some browsers (Firefox included) interpret
 page-down as "move the amount of space indicated by the height of the
 textarea". Since the textarea is so big, that essentially means, "move to
 the bottom of the post"!

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Ticket URL: <https://core.trac.wordpress.org/ticket/29561#comment:1>
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