sync code with last improvements from OpenBSD

doc/gl-docs/GL/gl/islist.3gl

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+'\" e
+'\"! eqn | mmdoc
+'\"macro stdmacro
+.ds Vn Version 1.2
+.ds Dt 24 September 1999
+.ds Re Release 1.2.1
+.ds Dp Jan 14 18:30
+.ds Dm 01 islist.gl
+.ds Xs 8931 3 islist.gl
+.TH GLISLIST 3G
+.SH NAME
+.B "glIsList
+\- determine if a name corresponds to a display-list
+
+.SH C SPECIFICATION
+GLboolean \f3glIsList\fP(
+GLuint \fIlist\fP )
+.nf
+.fi
+
+.SH PARAMETERS
+.TP \w'\f2list\fP\ \ 'u 
+\f2list\fP
+Specifies a potential display-list name.
+.SH DESCRIPTION
+\%\f3glIsList\fP returns \%\f3GL_TRUE\fP if \f2list\fP is the name
+of a display list and returns \%\f3GL_FALSE\fP otherwise.
+.SH ERRORS
+\%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glIsList\fP
+is executed between the execution of
+\%\f3glBegin\fP
+and the corresponding execution of \%\f3glEnd\fP.
+.SH SEE ALSO
+\%\f3glCallList(3G)\fP,
+\%\f3glCallLists(3G)\fP,
+\%\f3glDeleteLists(3G)\fP,
+\%\f3glGenLists(3G)\fP,
+\%\f3glNewList(3G)\fP