I didn't see a response to this, and I hope it's just because I sent it 
wrongly or something.  If not, is there something amiss with this?

Make a org-mode table.  In one of the cells of the table, have some text 
that is +struck out+.  Note that the struck-out text is default text 
color (black, for me), and not org-table text color (blue, for me). 
It's even worse if you're running org-variable-pitch-mode, because the 
text also won't be set in a fixed-pitch face, and so will screw up the 
alignment of table text.  I found out why.

When org-do-emphasis-faces constructs the new face that it applies to 
the text, it passes the lookup value from the org-emphasis-alist to 
font-lock-prepend-text-property, which makes a list, composing it with 
the existing face.  This would fail for strike-though mode in a table, 
since the org-emphasis-alist lookup would return (:strike-through t), 
resulting in a face of (:strike-through t org-table), which is an 
invalid face, and then emacs has no choice but to render it unfaced.

Attaching a patch for the issue.  Rather than try to figure out how to 
make org-do-emphasis-faces somehow smart enough to deal with this 
situation (I'm not sure it's possible, in general), I took the easy way 
out and defined an org-strike-through face which can be used in 
org-emphasis-alist.


Humbly submitted for your approval...


~mark