Revert "Fix editor:move-to-first-character-of-line with leading hard tabs"

This reverts commit 5cb084d56881e72bb4bba664098573594b2c0b57.
Revert ":memo: Mention Task::start/Task::send throw errors"

This reverts commit 4aba8fef7e3b500ae05a0dce4b0981391e47514c.
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