Scroll views up if needed to show all their content

[stefanhaller]

• PR Description

There are many situations where this can arise. Some examples are:

• the terminal window is small, and you are showing a view that shows more
  content than fits into the view port, and the view is scrolled all the way
  down; now you resize the terminal window to a taller size. Previously, the
  scroll position of the view would stay the same, so it would add blank space
  at the bottom; now it will scroll to fill that blank space with content
• expandFocusedSidePanel is on, you go to the bottom of a list view, now switch
  to a different panel, then scroll that (now unfocused) panel all the way down
  with the scroll wheel; now you focus that panel again. It becomes larger
  because of the accordion behavior, but would show blank space at the bottom.

And probably others that I can't remember right now. I only remember that I
always found it confusing to look at a view that had blank space at the bottom
even though it had more content to scroll into view.

• Please check if the PR fulfills these requirements

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• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• If a new UserConfig entry was added, make sure it can be hot-reloaded (see here)
• Docs have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for c28ecab1	✅ 90.48%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (c28ecab)	Report Missing	Report Missing	Report Missing
Head commit (6114f69)	49669	42518	85.60%

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Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#3839)	21	19	90.48%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[jesseduffield]

LGTM, great feature