Section 93 of the Constitution Act was last invoked during the Manitoba Schools Question of the 1890s, when French Catholics in that province fought an effort to abolish public funding for their schools.

Unfortunately, in my opinion, this does seem to imply that Section 93 has something to say about the question of funding.

Constitutional democracy is terrific in many ways, but one problem with the basic concept is that constitutions are written in specific political circumstances and then remain in effect long after those circumstances have changed. Section 93 dates from a time when the Catholic Church was far more politically powerful (at least in the West) than it is today, and when religion in general was taken more seriously, but it’s 2012 and we’re still lumbered with the bloody thing.

:
:

93. In and for each Province the Legislature may exclusively make Laws in relation to Education, subject and according to the following Provisions:

(1) Nothing in any such Law shall prejudicially affect any Right or Privilege with respect to Denominational Schools which any Class of Persons have by Law in the Province at the Union;

:

In other words, Catholics in Ontario currently have a constitutional right to (at least) the same level of publicly-funded Denominational education as they had in 1867, which I believe means up to Grade 10 or 11. (assuming this is the particular Union event being referred to).

I for one will be delighted to see something like the following happen for Ontario:

93A. Paragraphs (1) to (4) of section 93 do not apply to Quebec.