Formatting of existing code examples ruined (no indents, backslashed semicolons,...)

Something seems to have ruined the example code in many existing wiki articles – indenting is gone (all lines appear against left margin), and backslashes appear (only sometimes!) before semicolons or quotation marks.

See, for example, the code for

dynamicObjectProperty.qml  and dynamicObjectConnect.qml

in https://wiki.qt.io/QML_Dynamic_Objects

Is it possible to retrieve the earlier text (presumably from before some conversion was attempted) and re-convert those articles so they are readable?

(I'm viewing the articles in Firefox 65.0.1 in Ubuntu 18.10)