Before, we were using the same behavior as when we made any window
floating, which meant we'd set the window to 75% of the output's
dimensions. The issue is that, at least in my case, I usually want a
floating rule for windows that are small and have specific pre-set
sizes, so that didn't make sense. Now, if a window was made floating by
a rule, it should just start with its default dimensions but it can still
be resized later.
6136f9d3f8