Add new escape \F to switch font family.

* src/roff/troff/input.cc (token::next): Handle \F.
* src/roff/troff/env.cc (environment::set_family): Handle
`interrupted' flag.
* NEWS, doc/groff.texinfo, man/groff_diff.man, man/groff.man:
Document it.

* tmac/doc.tmac (doc-tag-list): Use \Z to avoid stretching of
spaces in tags.

* tmac/Xps.tmac: Remove some redundant code.

* tmac/doc-common, tmac/doc-ditroff, tmac/doc-nroff, tmac/doc.tmac,
tmac/dvi.tmac, contrib/groffer/groffer.man, man/roff.man,
man/groff_out.man, man/groff.man, man/groff_diff.man,
src/roff/groff/groff.man: Replace \f[P] with \f[].

1 files changed, 8 insertions, 8 deletions

diff --git a/tmac/doc-ditroff b/tmac/doc-ditroff
index dff5537d..fd2707ba 100644
--- a/tmac/doc-ditroff
+++ b/tmac/doc-ditroff
@@ -100,12 +100,12 @@
 .ds doc-Va-font \f[I]\s[\n[.ps]u]
 .ds doc-Xr-font \f[C]\s[\n[.ps]u]
 .
-.ds doc-left-parenthesis \f[R]\|(\|\f[P]\s[\n[.ps]u]
-.ds doc-right-parenthesis \f[R]\|)\|\f[P]\s[\n[.ps]u]
-.ds lp \f[R](\f[P]\s[\n[.ps]u]
-.ds rp \f[R])\f[P]\s[\n[.ps]u]
-.ds doc-left-bracket \f[R]\^[\^\f[P]\s[\n[.ps]u]
-.ds doc-right-bracket \f[R]\^]\f[P]\s[\n[.ps]u]
+.ds doc-left-parenthesis \f[R]\|(\|\f[]\s[\n[.ps]u]
+.ds doc-right-parenthesis \f[R]\|)\|\f[]\s[\n[.ps]u]
+.ds lp \f[R](\f[]\s[\n[.ps]u]
+.ds rp \f[R])\f[]\s[\n[.ps]u]
+.ds doc-left-bracket \f[R]\^[\^\f[]\s[\n[.ps]u]
+.ds doc-right-bracket \f[R]\^]\f[]\s[\n[.ps]u]
 .
 .tr *\[**]
 .
@@ -177,8 +177,8 @@
 .ds Gt >
 .ds Pm \[+-]
 .ds If \[if]
-.ds Na \f[I]NaN\f[P]
-.ds Ba \f[R]|\f[P]
+.ds Na \f[I]NaN\f[]
+.ds Ba \f[R]|\f[]
 .
 .nr gX 0
 .