When creating a formula and then adding a caption to it resizing the caption
(making it wider) causes the font in the formula to scale as if its an image,
but a formula is fundamentally text, not an image, so its size should be fixed
(or at least chosen from selected sizes like any other font). This bug means
that a short formula with a long caption will always result in a multi-line
caption, attempting to resize it to put the text on a single line (so it goes a
bit past the formula) results in resizing the actual font in the formula, and
they cannot be unbound.

To reproduce:
1) Insert->Formula, make it short, like 'a=x+y'
2) right-click the formula->Caption, make it a bit long, like 'this is something
you should know'
3) Try and make the caption stretch past the formula a bit, it can't be done

There should be an option to at least to at least unlock the size requirements
of the caption so the caption can be made wider without affecting the (so the
formula is maybe centered over the caption text instead of stretched over it).
Another option might be to treat formulas more like text in this context and let
the size of the characters be independent of the size of their containers (the
same way resizing the caption does not increase the size of the caption text)