In preparation for future changes: I want to add a mode where interactive editing is not done, and when this preparation is moved to a helper, it's much easier to skip it. e->line is initialized to 1 and overwritten even if sync fails. Theoretically this is against our style, but the alternative is to propagate a temporary value of line through the layers, which adds a lot of noise. If we fail, this EditFile object will not be used for anything, to the changed value of .line has no effect.
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