This replaces the use of ParserOutput::addJsConfigVars(), deprecated
since 1.38, and ensures that the IDs used for error messages are
independent of page parse order. (See T300979.)
This is an improved replacement for Ibd3fbcbc774491179b0d4fe29ba3b6a128220703
which was reverted (T346094).
Bug: T300307
Bug: T305161
Bug: T346094
Change-Id: I2c660972b289bbad730ceee1325d70d5ba75d27e
Use OOUI's PopupWidget to display error tracebacks/details instead of a
deprecated jquery.ui dialog.
Bug: T319361
Change-Id: Ie7796c853782de9874595674fe250f6702db717e
This is apparently unofficially deprecated, and we can do things a bit
more straightforwardly by using ParserOutput::addJsConfigVars() to
communicate the error messages to the JS.
This also takes the opportunity to move "ext.scribunto", which is mostly
about errors, to "ext.scribunto.errors".
Bug: T75618
Change-Id: I1577dab2dab1bd79cb127879de141fdbb8963aeb