Add the ability to edit and interact with the underlying document while the FIND FONT window is open (just like we can do while the regular FIND/CHANGE window is open)

When FIND FONT is open, the ONLY thing we can do is locate/substitute fonts. We aren't able to interact with the document in any other way. Often while using FIND FONT to locate where missing fonts are used, we find that the issue is actually just some text that we forgot to style properly, or a rogue invisible character that should simply be deleted. But in order to accomplish any simple edits like this, we have to close the FIND FONT window, make the text edit, and then reopen the FIND FONT to continue looking for other issues. This gets very tedious on long documents.