388284 - tabbing to a partially visible link should make it completely visible

Status: NEW

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

This is a followup to bug 66619.

Tabbing to a partially visible link should scroll the entire link into view.  Doing this requires:

 * Making focus events caused by link *clicks* not cause scrolling (i.e., fixing bug 195905 correctly)
 * Changing some or all users of NS_PRESSHELL_SCROLL_IF_NOT_VISIBLE to NS_PRESSHELL_SCROLL_ANYWHERE

Steps to reproduce:
 1. load attachment 111610 [details] (from bug 66619)
 2. Tab to the link that has "Some text after the span." before it
 3. Scroll the page down so that the previous link ("A long anchor that"...) is *partly* off the top of the viewport.
 4. Press Shift-TAB

Expected results:  Page scrolls so focused link is completely visible.

Actual results: no scrolling, since the link is already *partly* visible.