Live Preview in Mediawiki

The MediaWiki manual states the following:

Enabling live preview

Live preview is on or off depending on the $wgLivePreview variable of LocalSettings.php. To activate it you must also enable it on a per-user basis in the "editing" tab of you user preferences page.

However, when I go to the 开发者_如何学JAVAarticle describing the variable $wgLivePreview, it says that this variable was deprecated in 1.15.x.

Is there any alternative and relatively similar way of enabling Live Preview in the current version (1.16.5) of Mediawiki?

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It appears the variable (along with live preview itself) was removed in r59446; the feature was then restored in r62173 and turned completely always-on in r65390.

It looks like 1.16 was branched from around r62818, so you can set $wgLivePreview to make the option visible in the user preferences. Or apply r65390 to your local installation, or install the 1.17 beta release instead of 1.16.