Doesn't work with fixed core X fonts?

[CyberShadow]

With clean X resources (xrdb -query | grep -i urxvt | xrdb -remove):

urxvt ++iso14755 -fn 7x13 -pe font-size

The hotkeys seem to be intercepted, but have no effect.

Using xft:fixed:pixelsize=13 as the font works, however I understand that this causes font rendering to go through FreeType, thus is much less efficient than core X fonts.

[CyberShadow]

urxvt-resize-font supports resizing fixed fonts, so I switched to that.