HTML help that is shown instead of the plain help text where appropriate and supported by the interface. The command-line help output and the Qt GUI plugin tooltips show the plain help text, while the Qt GUI plugin preferences page displays the HTML help, if available, falling back to displaying the plain help otherwise. Allows to present the help text in a more structured and expressive way. Also useful for out-of-tree plugins, in case they want to link to plugin's home page, bug tracker, donation page, etc. For the supported HTML subset, see https://doc.qt.io/qt-6/richtext-html-subset.html Fixes #27798faf8b85a
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