The GNU tbl(1) program contained in the groff package internally

uses roff(7) tabulator settings to implement tables, and it used
to leak the changed tabulator settings from tables to the subsequent
roff(7) code.  In mandoc/tbl_term.c rev. 1.54 (June 17, 2017), code
was added to be bug-compatible with groff.

In commit d0e03cf6 (Oct 20, 2020), GNU tbl(1) changed behaviour
to save the tabulator settings before starting a table and restore
them afterwards.  Adjust mandoc for compatibility.

Since mandoc implements tables without using roff(7) tabulator
settings, saving and restoring tabulator settings is not needed in
mandoc.  Simply deleting the code that changed tabulator settings
by reverting tbl_term.c rev. 1.54 is sufficient in mandoc.
Also adjust the desired output of the regression tests
to match the new behaviour of both groff and mandoc.

7 files changed, 7 insertions, 18 deletions

diff --git a/regress/tbl/data/block_width.out_ascii b/regress/tbl/data/block_width.out_ascii
index 7058f54e..6600b7c0 100644
--- a/regress/tbl/data/block_width.out_ascii
+++ b/regress/tbl/data/block_width.out_ascii
@@ -61,6 +61,6 @@ DDEESSCCRRIIPPTTIIOONN
      |  |   |   |   |   |   |   | 90        |
      +--+---+---+---+---+---+---+-----------+
      leaked tab settings:
-       b   c   d   e   f   g   h
+          b    c    d    e    f    g    h
 
 OpenBSD                          July 4, 2017                          OpenBSD
diff --git a/regress/tbl/layout/center.out_ascii b/regress/tbl/layout/center.out_ascii
index 3196fff6..80e48d54 100644
--- a/regress/tbl/layout/center.out_ascii
+++ b/regress/tbl/layout/center.out_ascii
@@ -18,7 +18,7 @@ DDEESSCCRRIIPPTTIIOONN
        *****   *****   *****
 
        leaked tab settings:
-       a    b       c       de
+       a    b    c    de
 
 
 
diff --git a/regress/tbl/layout/spacing.out_ascii b/regress/tbl/layout/spacing.out_ascii
index 3d51d7d5..5eba1d80 100644
--- a/regress/tbl/layout/spacing.out_ascii
+++ b/regress/tbl/layout/spacing.out_ascii
@@ -32,7 +32,7 @@ DDEESSCCRRIIPPTTIIOONN
        |a  || b |
        +---++---+
        leaked tab settings:
-       a b     cdef
+       a    b    c    d    e    f
 
 
 
diff --git a/regress/tbl/layout/span.out_ascii b/regress/tbl/layout/span.out_ascii
index bc4badca..83d163f2 100644
--- a/regress/tbl/layout/span.out_ascii
+++ b/regress/tbl/layout/span.out_ascii
@@ -37,7 +37,7 @@ DDEESSCCRRIIPPTTIIOONN
        |a | b | c | d | e |
        +--+---+---+---+---+
        leaked tab settings:
-       a b   c   d   e   f
+       a    b    c    d    e    f
 
 
 
diff --git a/regress/tbl/mod/expand.out_ascii b/regress/tbl/mod/expand.out_ascii
index 41bf9869..6feeee25 100644
--- a/regress/tbl/mod/expand.out_ascii
+++ b/regress/tbl/mod/expand.out_ascii
@@ -97,7 +97,7 @@ DDEESSCCRRIIPPTTIIOONN
        x    x    x   x    x    123456789012345678901234567890123456789012    x
 
        leaked tab settings:
-       a b    c   d    e    f                                            g    h
+       a    b    c    d    e    f    g    h
 
 
 
diff --git a/regress/tbl/mod/font.out_ascii b/regress/tbl/mod/font.out_ascii
index 4e431870..3a6ca0d9 100644
--- a/regress/tbl/mod/font.out_ascii
+++ b/regress/tbl/mod/font.out_ascii
@@ -15,7 +15,7 @@ DDEESSCCRRIIPPTTIIOONN
        | _a_n_d   |  so   |   oonn   |
        +-------+-------+--------+
        leaked tab settings:
-       a      b       c        de
+       a    b    c    d    e
 
 
 
diff --git a/tbl_term.c b/tbl_term.c
index b124d2c0..476d182e 100644
--- a/tbl_term.c
+++ b/tbl_term.c
@@ -1,4 +1,4 @@
-/*	$Id: tbl_term.c,v 1.73 2020/01/11 16:26:08 schwarze Exp $ */
+/*	$Id: tbl_term.c,v 1.74 2020/10/25 18:28:23 schwarze Exp $ */
 /*
  * Copyright (c) 2009, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2011-2020 Ingo Schwarze <schwarze@openbsd.org>
@@ -190,17 +190,6 @@ term_tbl(struct termp *tp, const struct tbl_span *sp)
 
 		tblcalc(&tp->tbl, sp, tp->tcol->offset, tp->tcol->rmargin);
 
-		/* Tables leak .ta settings to subsequent text. */
-
-		term_tab_set(tp, NULL);
-		coloff = sp->opts->opts & (TBL_OPT_BOX | TBL_OPT_DBOX) ||
-		    sp->opts->lvert;
-		for (ic = 0; ic < sp->opts->cols; ic++) {
-			coloff += tp->tbl.cols[ic].width;
-			term_tab_iset(coloff);
-			coloff += tp->tbl.cols[ic].spacing;
-		}
-
 		/* Center the table as a whole. */
 
 		offset = tp->tcol->offset;