DevelopmentSettings: Enable Vue development mode

Change-Id: Id68a44273c6eb546873e4408e56aaa5569a2dade

RELEASE-NOTES-1.40

@@ -70,6 +70,7 @@ For notes on 1.39.x and older releases, see HISTORY.
   - ContentHandler::getParserOutputForIndexing
   - ContentHandler::getDataForSearchIndex
   - the SearchDataForIndex hook is deprecated in favor of SearchDataForIndex2
+* Vue development mode is enabled by default in DevelopmentSettings.php
 * …
 
 === External library changes in 1.40 ===

includes/DevelopmentSettings.php

@@ -108,6 +108,9 @@ $wgMaxArticleSize = 20; // in Kilobyte
 $wgParsoidSettings['wt2htmlLimits']['wikitextSize'] = 20 * 1024; // $wgMaxArticleSize, in byte
 $wgParsoidSettings['html2wtLimits']['htmlSize'] = 100 * 1024; // in characters!
 
+// Enable Vue dev mode by default, so that Vue devtools are functional.
+$wgVueDevelopmentMode = true;
+
 /**
  * Experimental changes that may later become the default.
  * (Must reference a Phabricator ticket)