> It seems there is a problem when a float is being used as the parameter
 > value of either `width' or `height' in a `make-frame' call: The X server
 > reports a BadDrawable error and Emacs aborts.  This behaviour occurs
 > deterministically in both window-managers I've tried, i.e. i3 and
 > fluxbox.  A backtrace follows.

Does the attached patch fix it?  If so, I'll install it on the release
branch.  OK Eli?

Many thanks for the report, martin