templates: make {indent("", " ")} be empty indent() is documented to indent all non-empty lines, but it made an exception for the first line, which always got indented. I also made indent() not indent the first line even if an indent override was given for the first line. I think that is what one would usually want. Differential Revision: https://phab.mercurial-scm.org/D7432

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== New Features ==

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== New Experimental Features ==

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== Bug Fixes  ==

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 * The `indent()` template function was documented to not indent empty lines,

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   but it still indented the first line even if it was empty. It no longer does

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   that.

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== Backwards Compatibility Changes ==

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== Internal API Changes ==

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