main : Fix Ctrl+D/newline handling #12951
Merged
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This restores the behavior from #491. This does not affect Ctrl+D's ability to terminate --multiline-input lines (#1040).
This also actually implements #587: "If the user wants the text to end in a newline, this should be accomplished by explicitly adding a newline by using \ followed by return, then returning control by pressing return again."
Fixes #12949