This is really annoying.
Whenever I need to do a find/replace, I select some text, hit command-E to add this to the text to search for.
Then command-option-f to bring up find/replace.
I go through typing my replace stuff, and hit "replace all" and the first one only goes -- since the "selected text" button is active, I presume since I have a selection.
I happen to have a selection, but I expected to search the whole document. I'd rather MANUALLY turn on "search selection only".