We're shipping this patch in Debian. It adds a few more compose combinations for the Euro sign.
Created attachment 6120 [details] [review] More compose keys for Euro sign
Sorry about the phenomenal bug spam, guys. Adding xorg-team@ to the QA contact so bugs don't get lost in future.
David, does the patch work when the locale is UTF-8?
fixed in commit 1f980cb7d022f53d0aee9e793b08203fb888e86e
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