Fixed a box clipping problem with some inline layouts.
The clipping code here probably needs to be reworked. The clipping shapes appear to feed back into the box culling part of the paint process.
I'm also unsure what the intent was behind the multi ranged clip code in BoxRangeHelper. The way it was implemented prevented multi box clips to reset properly on pop. I fixed that problem, but then other paint problems led me to think that multi box clips probably need to be union'd, which seems to solve the initial problems.
If the code was better documented I might be able to work out what the intent was. But because of no documentation I'm leading to wanting to rework the code to make the intent specified.