[Bug 201367] Reproducible urxvt Artifact

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201367

            Bug ID: 201367
           Summary: Reproducible urxvt Artifact
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: lens.fbsd at gmail.com

Using urxvt, I come across a "D" artifact when coding in C quite often. This
happens when I press Ctrl+D during a getchar() while loop that looks for EOF.

The following example is a piece of code that's still in progress; it is not
correct/complete in and of itself but the problem itself is reproducible using
a basic loop for this. (while ((blah = getchar()) != EOF) ...)

Code: https://ideone.com/fUEUgw
Result: http://ideone.com/Y0rpJw

Other people have produced this result on 10.1-RELEASE-P9 (amd64), 11-CURRENT
(i386), 10.1-RELEASE (arm), 10.1-RELEASE-P10 and even netbsd-current/amd64.

My uname -a: FreeBSD strawberry 10.1-RELEASE-p10 FreeBSD 10.1-RELEASE-p10 #0:
Wed May 13 06:54:13 UTC 2015    
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

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