remove some support for long lines from source editor

A code editor is unlikely to need support for extremely long lines. And
that kind of scroll is jarring anyway in a code editor. We don't read
code like a novel, and less scroll per page implies more scrolling work.

I'd gotten rid of this functionality and the test for it [1] back in the
spokecone fork, but only took out the test when first pulling it into
the source editor.

[1] test_pagedown_often_shows_start_of_wrapping_line

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