wm4 e5d3180889 charset_conv: use our own UTF-8 check with ENCA only ...

Some charsets can look like valid UTF-8, but aren't UTF-8. One example
is ISO-2022-JP. While ENCA apparently likes to get misdetect real UTF-8,
this is not the case with uchardet. uchardet can detect ISO-2022-JP
correctly, but didn't even get to try, because our own UTF-8 check
succeeded. So run the UTF-8 check when using ENCA only.

Fixes #2195.

2015-08-04 18:58:58 +02:00

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