When displaying the formatting menu, place a check mark next to the current paragraph style (assuming there is one, and it is a single style rather than multiple).
When displaying the formatting menu, place a check mark next to the current paragraph
style (assuming there is one, and it is a single style rather than multiple).

This required a change to getAllProperties() in Formatting.js to report style names
corresponding to HTML elements in lowercase, since canonicaliseSelector() converts to
lower case.

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