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slightly improve deepcopy everywhere

reindent

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Merge lines.love

bugfix: scrolling up using scroll wheel

The culprit is an ambiguously named helper. put_cursor_on_next_text_line
is not supposed to move to next line if the current line is text.

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clarify a misleading test

I'm still using these to periodically reassure myself about the state of
lines2 and its descendants.

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Merge lines.love

drop an unused variable

delete redundant method description

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Merge lines.love

simpler implementation of bugfix #2

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some more renames

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