Qoth the manpage of urxvt:
-bl Compile frills: Set MWM hints to request a borderless window, i.e.
if honoured by the WM, the rxvt-unicode window will not have
window decorations; resource borderLess. If the window manager does not
support MWM hints (e.g. kwin), enables override-redirect mode.
Since awesome does not support MWM hints, urxvt enables
override-redirect which causes awesome to think "hey! that window does
not want to be managed by me!" which it indeed then does not do. My
approach to making a window borderless would be to simply not set a
border width on that window.
--
Gregor Best
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