Getting X11 forwarding through ssh working after running su
X authentication is based on cookies -- secret little pieces of random data that only you and the X server know... So, you need to let the other user in on what your cookie is.
One way to do this is as follows:
Before you issue the su or sudo (but after having ssh'ed into the remote system), request the cookie for the current DISPLAY that's connecting to your X server:
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