user/xterm: fix regression when using tmux horizontal splits

1 files changed, 213 insertions, 0 deletions

diff --git a/user/xterm/revert-xterm-347i.patch b/user/xterm/revert-xterm-347i.patch
new file mode 100644
index 000000000..aa49ac3b9
--- /dev/null
+++ b/user/xterm/revert-xterm-347i.patch
@@ -0,0 +1,213 @@
+From 97ef79a674a13f806c58dc7d6eeeaa2e31cbca11 Mon Sep 17 00:00:00 2001
+From: Max Rees <maxcrees@me.com>
+Date: Sun, 18 Aug 2019 21:12:19 -0500
+Subject: [PATCH] Revert "snapshot of project "xterm", label xterm-347i"
+
+The changes introduced in xterm-347i cause a regression in tmux's
+"horizontal" (read: one pane on the left, and one pane on the right)
+splitting behavior, making the graphical output unstable and unreadable.
+
+This reverts commit 7914e2709aa7836bfb61cd21f83880d4b7d44d8d.
+---
+ charproc.c | 43 +++++++++++++++----------------------------
+ screen.c   |  5 +++--
+ util.c     |  3 +--
+ xterm.h    | 16 +++-------------
+ 4 files changed, 22 insertions(+), 45 deletions(-)
+
+diff --git a/charproc.c b/charproc.c
+index 5c0536c..3b04842 100644
+--- a/charproc.c
++++ b/charproc.c
+@@ -1280,7 +1280,7 @@ set_ansi_conformance(TScreen *screen, int level)
+  * Set scrolling margins.  VTxxx terminals require that the top/bottom are
+  * different, so we have at least two lines in the scrolling region.
+  */
+-static void
++void
+ set_tb_margins(TScreen *screen, int top, int bottom)
+ {
+     TRACE(("set_tb_margins %d..%d, prior %d..%d\n",
+@@ -1297,7 +1297,7 @@ set_tb_margins(TScreen *screen, int top, int bottom)
+ 	screen->bot_marg = screen->max_row;
+ }
+ 
+-static void
++void
+ set_lr_margins(TScreen *screen, int left, int right)
+ {
+     TRACE(("set_lr_margins %d..%d, prior %d..%d\n",
+@@ -1317,26 +1317,13 @@ set_lr_margins(TScreen *screen, int left, int right)
+ #define reset_tb_margins(screen) set_tb_margins(screen, 0, screen->max_row)
+ #define reset_lr_margins(screen) set_lr_margins(screen, 0, screen->max_col)
+ 
+-void
+-resetMargins(XtermWidget xw)
++static void
++reset_margins(TScreen *screen)
+ {
+-    TScreen *screen = TScreenOf(xw);
+-
+-    UIntClr(xw->flags, LEFT_RIGHT);
+     reset_tb_margins(screen);
+     reset_lr_margins(screen);
+ }
+ 
+-static void
+-resetRendition(XtermWidget xw)
+-{
+-    TScreen *screen = TScreenOf(xw);
+-    (void) screen;
+-    ResetItalics(xw);
+-    UIntClr(xw->flags,
+-	    (SGR_MASK | SGR_MASK2 | INVISIBLE));
+-}
+-
+ void
+ set_max_col(TScreen *screen, int cols)
+ {
+@@ -3225,7 +3212,9 @@ doparsing(XtermWidget xw, unsigned c, struct ParseState *sp)
+ 		case DEFAULT:
+ 		    /* FALLTHRU */
+ 		case 0:
+-		    resetRendition(xw);
++		    ResetItalics(xw);
++		    UIntClr(xw->flags,
++			    (SGR_MASK | SGR_MASK2 | INVISIBLE));
+ 		    if_OPT_ISO_COLORS(screen, {
+ 			reset_SGR_Colors(xw);
+ 		    });
+@@ -3706,12 +3695,7 @@ doparsing(XtermWidget xw, unsigned c, struct ParseState *sp)
+ 	    TRACE(("CASE_DECALN - alignment test\n"));
+ 	    if (screen->cursor_state)
+ 		HideCursor();
+-	    /*
+-	     * DEC STD 070 does not mention left/right margins.  Likely the
+-	     * text was for VT100, and not updated for VT420.
+-	     */
+-	    resetRendition(xw);
+-	    resetMargins(xw);
++	    reset_margins(screen);
+ 	    CursorSet(screen, 0, 0, xw->flags);
+ 	    xtermParseRect(xw, 0, 0, &myRect);
+ 	    ScrnFillRectangle(xw, &myRect, 'E', 0, False);
+@@ -6074,13 +6058,16 @@ dpmodes(XtermWidget xw, BitFunc func)
+ 	    if (screen->c132) {
+ 		if (!(xw->flags & NOCLEAR_COLM))
+ 		    ClearScreen(xw);
++		CursorSet(screen, 0, 0, xw->flags);
+ 		if ((j = IsSM()? 132 : 80) !=
+ 		    ((xw->flags & IN132COLUMNS) ? 132 : 80) ||
+ 		    j != MaxCols(screen))
+ 		    RequestResize(xw, -1, j, True);
+ 		(*func) (&xw->flags, IN132COLUMNS);
+-		resetMargins(xw);
+-		CursorSet(screen, 0, 0, xw->flags);
++		if (xw->flags & IN132COLUMNS) {
++		    UIntClr(xw->flags, LEFT_RIGHT);
++		    reset_lr_margins(screen);
++		}
+ 	    }
+ 	    break;
+ 	case srm_DECSCLM:	/* (slow scroll)        */
+@@ -10636,7 +10623,7 @@ VTRealize(Widget w,
+     set_cur_row(screen, 0);
+     set_max_col(screen, Width(screen) / screen->fullVwin.f_width - 1);
+     set_max_row(screen, Height(screen) / screen->fullVwin.f_height - 1);
+-    resetMargins(xw);
++    reset_margins(screen);
+ 
+     memset(screen->sc, 0, sizeof(screen->sc));
+ 
+@@ -11951,7 +11938,7 @@ ReallyReset(XtermWidget xw, Bool full, Bool saved)
+ #endif
+ 
+     /* reset scrolling region */
+-    resetMargins(xw);
++    reset_margins(screen);
+ 
+     bitclr(&xw->flags, ORIGIN);
+ 
+diff --git a/screen.c b/screen.c
+index 4e8a0bf..2af76bc 100644
+--- a/screen.c
++++ b/screen.c
+@@ -1,4 +1,4 @@
+-/* $XTermId: screen.c,v 1.578 2019/07/19 22:35:41 tom Exp $ */
++/* $XTermId: screen.c,v 1.577 2019/06/30 18:45:09 tom Exp $ */
+ 
+ /*
+  * Copyright 1999-2018,2019 by Thomas E. Dickey
+@@ -2236,7 +2236,8 @@ ScreenResize(XtermWidget xw,
+ 	}
+ 
+ 	/* adjust scrolling region */
+-	resetMargins(xw);
++	set_tb_margins(screen, 0, screen->max_row);
++	set_lr_margins(screen, 0, screen->max_col);
+ 	UIntClr(*flags, ORIGIN);
+ 
+ 	if (screen->cur_row > screen->max_row)
+diff --git a/util.c b/util.c
+index 7623efa..7300300 100644
+--- a/util.c
++++ b/util.c
+@@ -1,4 +1,4 @@
+-/* $XTermId: util.c,v 1.803 2019/07/20 00:10:34 tom Exp $ */
++/* $XTermId: util.c,v 1.802 2019/07/19 00:40:41 tom Exp $ */
+ 
+ /*
+  * Copyright 1999-2018,2019 by Thomas E. Dickey
+@@ -3687,7 +3687,6 @@ drawXtermText(XtermWidget xw,
+ #define NOT_BOLD (attr_flags & ~BOLDATTR(screen))
+ 	font = getNormXftFont(xw, attr_flags, &did_ul);
+ 	font0 = IS_BOLD ? getNormXftFont(xw, NOT_BOLD, &did_ul) : font;
+-	(void) font0;
+ #if OPT_RENDERWIDE
+ 	wfont = getWideXftFont(xw, attr_flags);
+ 	wfont0 = IS_BOLD ? getWideXftFont(xw, NOT_BOLD) : wfont;
+diff --git a/xterm.h b/xterm.h
+index 89a4482..fecac7f 100644
+--- a/xterm.h
++++ b/xterm.h
+@@ -1,4 +1,4 @@
+-/* $XTermId: xterm.h,v 1.841 2019/07/19 22:35:06 tom Exp $ */
++/* $XTermId: xterm.h,v 1.839 2019/07/19 00:40:41 tom Exp $ */
+ 
+ /*
+  * Copyright 1999-2018,2019 by Thomas E. Dickey
+@@ -957,11 +957,12 @@ extern void lookupSelectUnit(XtermWidget /* xw */, Cardinal /* item */, String /
+ extern void releaseCursorGCs(XtermWidget /*xw*/);
+ extern void releaseWindowGCs(XtermWidget /*xw*/, VTwin * /*win*/);
+ extern void resetCharsets (TScreen * /* screen */);
+-extern void resetMargins (XtermWidget /* xw */);
+ extern void restoreCharsets (TScreen * /* screen */, DECNRCM_codes * /* source */);
+ extern void saveCharsets (TScreen * /* screen */, DECNRCM_codes * /* target */);
+ extern void set_max_col(TScreen *  /* screen */, int  /* cols */);
+ extern void set_max_row(TScreen *  /* screen */, int  /* rows */);
++extern void set_lr_margins (TScreen * /* screen */, int  /* left */, int  /* right */);
++extern void set_tb_margins (TScreen * /* screen */, int  /* top */, int  /* bottom */);
+ extern void unparse_end (XtermWidget /* xw */);
+ extern void unparseputc (XtermWidget /* xw */, int  /* c */);
+ extern void unparseputc1 (XtermWidget /* xw */, int  /* c */);
+@@ -1406,17 +1407,6 @@ extern void LineSetFlag(LineData /* ld */, int /* flag */);
+ #define ScrnIsColInMargins(screen, col) \
+ 	((col) >= (screen)->lft_marg && (col) <= (screen)->rgt_marg)
+ 
+-/*
+- * If the vertical scrolling margins are active, they will be something other
+- * than the first/last row of the visible screen, as well as being distinct.
+- */
+-#define IsTopBottomMode(xw)	(ScrnTopMargin(xw) < ScrnBottomMargin(xw))
+-#define ScrnTopMargin(xw)	TScreenOf(xw)->top_marg
+-#define ScrnBottomMargin(xw)	TScreenOf(xw)->bot_marg
+-
+-/*
+- * Left/right horizontal scrolling margins are only active when DECLRMM is.
+- */
+ #define IsLeftRightMode(xw) ((xw)->flags & LEFT_RIGHT)
+ #define ScrnLeftMargin(xw)  (IsLeftRightMode(xw) \
+ 			     ? TScreenOf(xw)->lft_marg \
+-- 
+2.22.1
+