Support for windows larger than the client.

This adds two new options, window-size and default-size, and a new
command, resize-window.

The force-width and force-height options, and the session_width and
session_height formats have been removed.

The new window-size option tells tmux how to work out the size of
windows: largest means it picks the size of the largest session,
smallest the smallest session (similar to the old behaviour) and
manual means that it does not automatically resize
windows. aggressive-resize modifies the choice of session for largest
and smallest as it did before.

If a window is in a session attached to a client that is too small,
only part of the window is shown. tmux attempts to keep the cursor
visible, so the part of the window displayed is changed as the cursor
moves (with a small delay, to try and avoid excess redrawing when
applications redraw status lines or similar that are not currently
visible).

Drawing windows which are larger than the client is not as efficient
as those which fit, particularly when the cursor moves, so it is
recommended to avoid using this on slow machines or networks (set
window-size to smallest or manual).

The resize-window command can be used to resize a window manually. If
it is used, the window-size option is automatically set to manual for
the window (undo this with "setw -u window-size"). resize-window works
in a similar way to resize-pane (-U -D -L -R -x -y flags) but also has
-a and -A flags. -a sets the window to the size of the smallest client
(what it would be if window-size was smallest) and -A the largest.

For the same behaviour as force-width or force-height, use
resize-width -x or -y.

If the global window-size option is set to manual, the default-size
option is used for new windows. If -x or -y is used with new-session,
that sets the default-size option for the new session.

The maximum size of a window is 10000x10000. But expect applications
to complain and higher memory use if you make a window that big. The
minimum size is the size required for the current layout including
borders.

This change allows some code improvements, most notably that since
windows can now never be cropped, that code can be removed from the
layout code, and since panes can now never be outside the size of the
window, window_pane_visible can be removed.

1 files changed, 381 insertions, 67 deletions

diff --git a/tty.c b/tty.c
index 2397f8c4..b6339266 100644
--- a/tty.c
+++ b/tty.c
@@ -64,6 +64,7 @@ static void	tty_redraw_region(struct tty *, const struct tty_ctx *);
 static void	tty_emulate_repeat(struct tty *, enum tty_code_code,
 		    enum tty_code_code, u_int);
 static void	tty_repeat_space(struct tty *, u_int);
+static void	tty_draw_pane(struct tty *, const struct tty_ctx *, u_int);
 static void	tty_cell(struct tty *, const struct grid_cell *,
 		    const struct window_pane *);
 static void	tty_default_colours(struct grid_cell *,
@@ -698,11 +699,117 @@ tty_repeat_space(struct tty *tty, u_int n)
 		tty_putn(tty, s, n, n);
 }
 
+/* Is this window bigger than the terminal? */
+int
+tty_window_bigger(struct tty *tty)
+{
+	struct window	*w = tty->client->session->curw->window;
+	u_int		 lines;
+
+	lines = tty_status_lines(tty);
+	return (tty->sx < w->sx || tty->sy - lines < w->sy);
+}
+
+/* What offset should this window be drawn at? */
+int
+tty_window_offset(struct tty *tty, u_int *ox, u_int *oy, u_int *sx, u_int *sy)
+{
+	*ox = tty->oox;
+	*oy = tty->ooy;
+	*sx = tty->osx;
+	*sy = tty->osy;
+
+	return (tty->oflag);
+}
+
+/* What offset should this window be drawn at? */
+static int
+tty_window_offset1(struct tty *tty, u_int *ox, u_int *oy, u_int *sx, u_int *sy)
+{
+	struct window		*w = tty->client->session->curw->window;
+	struct window_pane	*wp = w->active;
+	u_int			 cx, cy, lines;
+
+	lines = tty_status_lines(tty);
+	if (tty->sx >= w->sx && tty->sy - lines >= w->sy) {
+		*ox = 0;
+		*oy = 0;
+		*sx = w->sx;
+		*sy = w->sy;
+		return (0);
+	}
+
+	*sx = tty->sx;
+	*sy = tty->sy - lines;
+
+	if (~wp->screen->mode & MODE_CURSOR) {
+		*ox = 0;
+		*oy = 0;
+	} else {
+		cx = wp->xoff + wp->screen->cx;
+		cy = wp->yoff + wp->screen->cy;
+
+		if (cx < *sx)
+			*ox = 0;
+		else if (cx > w->sx - *sx)
+			*ox = w->sx - *sx;
+		else
+			*ox = cx - *sx / 2;
+
+		if (cy < *sy)
+			*oy = 0;
+		else if (cy > w->sy - *sy)
+			*oy = w->sy - *sy;
+		else
+			*oy = cy - *sy / 2;
+	}
+
+	return (1);
+}
+
+/* Update stored offsets for a window and redraw if necessary. */
+void
+tty_update_window_offset(struct window *w)
+{
+	struct client	*c;
+
+	TAILQ_FOREACH(c, &clients, entry) {
+		if (c->session != NULL && c->session->curw->window == w)
+			tty_update_client_offset(c);
+	}
+}
+
+/* Update stored offsets for a client and redraw if necessary. */
+void
+tty_update_client_offset(struct client *c)
+{
+	u_int	ox, oy, sx, sy;
+
+	c->tty.oflag = tty_window_offset1(&c->tty, &ox, &oy, &sx, &sy);
+	if (ox == c->tty.oox &&
+	    oy == c->tty.ooy &&
+	    sx == c->tty.osx &&
+	    sy == c->tty.osy)
+		return;
+
+	log_debug ("%s: %s offset has changed (%u,%u %ux%u -> %u,%u %ux%u)",
+	    __func__, c->name, c->tty.oox, c->tty.ooy, c->tty.osx, c->tty.osy,
+	    ox, oy, sx, sy);
+
+	c->tty.oox = ox;
+	c->tty.ooy = oy;
+	c->tty.osx = sx;
+	c->tty.osy = sy;
+
+	c->flags |= CLIENT_REDRAWWINDOW;
+}
+
 /* How many lines are taken up by the status line on this client? */
 u_int
-tty_status_lines(struct client *c)
+tty_status_lines(struct tty *tty)
 {
-	u_int	lines;
+	struct client	*c = tty->client;
+	u_int		 lines;
 
 	if (c->flags & CLIENT_STATUSOFF)
 		lines = 0;
@@ -770,18 +877,73 @@ tty_redraw_region(struct tty *tty, const struct tty_ctx *ctx)
 
 	if (ctx->ocy < ctx->orupper || ctx->ocy > ctx->orlower) {
 		for (i = ctx->ocy; i < screen_size_y(s); i++)
-			tty_draw_pane(tty, wp, i, ctx->xoff, ctx->yoff);
+			tty_draw_pane(tty, ctx, i);
 	} else {
 		for (i = ctx->orupper; i <= ctx->orlower; i++)
-			tty_draw_pane(tty, wp, i, ctx->xoff, ctx->yoff);
+			tty_draw_pane(tty, ctx, i);
+	}
+}
+
+/* Is this position visible in the pane? */
+static int
+tty_is_visible(const struct tty_ctx *ctx, u_int px, u_int py, u_int nx,
+    u_int ny)
+{
+	struct window_pane	*wp = ctx->wp;
+	u_int			 xoff = wp->xoff + px, yoff = wp->yoff + py;
+
+	if (!ctx->bigger)
+		return (1);
+	if (xoff + nx <= ctx->ox || xoff >= ctx->ox + ctx->sx ||
+	    yoff + ny <= ctx->oy || yoff >= ctx->oy + ctx->sy) {
+		return (0);
+	}
+	return (1);
+}
+
+/* Clamp line position to visible part of pane. */
+static int
+tty_clamp_line(const struct tty_ctx *ctx, u_int px, u_int py, u_int nx,
+    u_int *i, u_int *x, u_int *rx)
+{
+	struct window_pane	*wp = ctx->wp;
+	u_int			 xoff = wp->xoff + px;
+
+	if (!tty_is_visible(ctx, px, py, nx, 1))
+		return (0);
+
+	if (xoff >= ctx->ox && xoff + nx <= ctx->ox + ctx->sx) {
+		/* All visible. */
+		*i = 0;
+		*x = xoff - ctx->ox;
+		*rx = nx;
+	} else if (xoff < ctx->ox && xoff + nx > ctx->ox + ctx->sx) {
+		/* Both left and right not visible. */
+		*i = ctx->ox;
+		*x = 0;
+		*rx = ctx->sx;
+	} else if (xoff < ctx->ox) {
+		/* Left not visible. */
+		*i = ctx->ox - xoff;
+		*x = 0;
+		*rx = nx - *i;
+	} else {
+		/* Right not visible. */
+		*i = 0;
+		*x = xoff - ctx->ox;
+		*rx = nx - (xoff + nx - ctx->sx);
 	}
+	return (1);
 }
 
+/* Clear a line. */
 static void
 tty_clear_line(struct tty *tty, const struct window_pane *wp, u_int py,
     u_int px, u_int nx, u_int bg)
 {
-	log_debug("%s: %u at %u,%u", __func__, nx, px, py);
+	struct client	*c = tty->client;
+
+	log_debug("%s: %s, %u at %u,%u", __func__, c->name, nx, px, py);
 
 	/* Nothing to clear. */
 	if (nx == 0)
@@ -816,14 +978,84 @@ tty_clear_line(struct tty *tty, const struct window_pane *wp, u_int py,
 	tty_repeat_space(tty, nx);
 }
 
+/* Clear a line, adjusting to visible part of pane. */
+static void
+tty_clear_pane_line(struct tty *tty, const struct tty_ctx *ctx, u_int py,
+    u_int px, u_int nx, u_int bg)
+{
+	u_int	i, x, rx;
+
+	if (tty_clamp_line(ctx, px, py, nx, &i, &x, &rx))
+		tty_clear_line(tty, ctx->wp, py - ctx->oy, x, rx, bg);
+}
+
+/* Clamp area position to visible part of pane. */
+static int
+tty_clamp_area(const struct tty_ctx *ctx, u_int px, u_int py, u_int nx,
+    u_int ny, u_int *i, u_int *j, u_int *x, u_int *y, u_int *rx, u_int *ry)
+{
+	struct window_pane	*wp = ctx->wp;
+	u_int			 xoff = wp->xoff + px, yoff = wp->yoff + py;
+
+	if (xoff + nx <= ctx->ox || xoff >= ctx->ox + ctx->sx ||
+	    yoff + ny <= ctx->oy || yoff >= ctx->oy + ctx->sy)
+		return (0);
+
+	if (xoff >= ctx->ox && xoff + nx <= ctx->ox + ctx->sx) {
+		/* All visible. */
+		*i = 0;
+		*x = xoff - ctx->ox;
+		*rx = nx;
+	} else if (xoff < ctx->ox && xoff + nx > ctx->ox + ctx->sx) {
+		/* Both left and right not visible. */
+		*i = ctx->ox;
+		*x = 0;
+		*rx = ctx->sx;
+	} else if (xoff < ctx->ox) {
+		/* Left not visible. */
+		*i = ctx->ox - xoff;
+		*x = 0;
+		*rx = nx - *i;
+	} else {
+		/* Right not visible. */
+		*i = 0;
+		*x = xoff - ctx->ox;
+		*rx = nx - (xoff + nx - ctx->sx);
+	}
+	if (yoff >= ctx->oy && yoff + ny <= ctx->oy + ctx->sy) {
+		/* All visible. */
+		*j = 0;
+		*y = yoff - ctx->oy;
+		*ry = ny;
+	} else if (yoff < ctx->oy && yoff + ny > ctx->oy + ctx->sy) {
+		/* Both left and right not visible. */
+		*j = ctx->oy;
+		*y = 0;
+		*ry = ctx->sy;
+	} else if (yoff < ctx->oy) {
+		/* Left not visible. */
+		*j = ctx->oy - yoff;
+		*y = 0;
+		*ry = ny - *j;
+	} else {
+		/* Right not visible. */
+		*j = 0;
+		*y = yoff - ctx->oy;
+		*ry = ny - (yoff + ny - ctx->sy);
+	}
+	return (1);
+}
+
+/* Clear an area, adjusting to visible part of pane. */
 static void
 tty_clear_area(struct tty *tty, const struct window_pane *wp, u_int py,
     u_int ny, u_int px, u_int nx, u_int bg)
 {
-	u_int	yy;
-	char	tmp[64];
+	struct client	*c = tty->client;
+	u_int		 yy;
+	char		 tmp[64];
 
-	log_debug("%s: %u,%u at %u,%u", __func__, nx, ny, px, py);
+	log_debug("%s: %s, %u,%u at %u,%u", __func__, c->name, nx, ny, px, py);
 
 	/* Nothing to clear. */
 	if (nx == 0 || ny == 0)
@@ -886,11 +1118,33 @@ tty_clear_area(struct tty *tty, const struct window_pane *wp, u_int py,
 		tty_clear_line(tty, wp, yy, px, nx, bg);
 }
 
-void
-tty_draw_pane(struct tty *tty, const struct window_pane *wp, u_int py, u_int ox,
-    u_int oy)
+/* Clear an area in a pane. */
+static void
+tty_clear_pane_area(struct tty *tty, const struct tty_ctx *ctx, u_int py,
+    u_int ny, u_int px, u_int nx, u_int bg)
+{
+	u_int	i, j, x, y, rx, ry;
+
+	if (tty_clamp_area(ctx, px, py, nx, ny, &i, &j, &x, &y, &rx, &ry))
+		tty_clear_area(tty, ctx->wp, y, ry, x, rx, bg);
+}
+
+static void
+tty_draw_pane(struct tty *tty, const struct tty_ctx *ctx, u_int py)
 {
-	tty_draw_line(tty, wp, wp->screen, py, ox, oy);
+	struct window_pane	*wp = ctx->wp;
+	struct screen		*s = wp->screen;
+	u_int			 xoff = ctx->xoff, yoff = ctx->yoff;
+	u_int			 nx = screen_size_x(s), i, x, rx;
+
+	log_debug("%s: %s %u %d", __func__, tty->client->name, py, ctx->bigger);
+
+	if (!ctx->bigger) {
+		tty_draw_line(tty, wp, s, 0, py, nx, xoff, yoff + py);
+		return;
+	}
+	if (tty_clamp_line(ctx, 0, py, nx, &i, &x, &rx))
+		tty_draw_line(tty, wp, s, i, py, rx, x, yoff + py - ctx->oy);
 }
 
 static const struct grid_cell *
@@ -919,17 +1173,27 @@ tty_check_codeset(struct tty *tty, const struct grid_cell *gc)
 
 void
 tty_draw_line(struct tty *tty, const struct window_pane *wp,
-    struct screen *s, u_int py, u_int ox, u_int oy)
+    struct screen *s, u_int px, u_int py, u_int nx, u_int atx, u_int aty)
 {
 	struct grid		*gd = s->grid;
 	struct grid_cell	 gc, last;
 	const struct grid_cell	*gcp;
-	u_int			 i, j, ux, sx, nx, width;
+	struct grid_line	*gl;
+	u_int			 i, j, ux, sx, width;
 	int			 flags, cleared = 0;
 	char			 buf[512];
 	size_t			 len, old_len;
 	u_int			 cellsize;
 
+	log_debug("%s: px=%u py=%u nx=%u atx=%u aty=%u", __func__,
+	    px, py, nx, atx, aty);
+
+	/*
+	 * py is the line in the screen to draw.
+	 * px is the start x and nx is the width to draw.
+	 * atx,aty is the line on the terminal to draw it.
+	 */
+
 	flags = (tty->flags & TTY_NOCURSOR);
 	tty->flags |= TTY_NOCURSOR;
 	tty_update_mode(tty, tty->mode, s);
@@ -942,41 +1206,48 @@ tty_draw_line(struct tty *tty, const struct window_pane *wp,
 	 * there may be empty background cells after it (from BCE).
 	 */
 	sx = screen_size_x(s);
-
+	if (nx > sx)
+		nx = sx;
 	cellsize = grid_get_line(gd, gd->hsize + py)->cellsize;
 	if (sx > cellsize)
 		sx = cellsize;
 	if (sx > tty->sx)
 		sx = tty->sx;
+	if (sx > nx)
+		sx = nx;
 	ux = 0;
 
+	if (py == 0)
+		gl = NULL;
+	else
+		gl = grid_get_line(gd, gd->hsize + py - 1);
 	if (wp == NULL ||
-	    py == 0 ||
-	    (~grid_get_line(gd, gd->hsize + py - 1)->flags & GRID_LINE_WRAPPED) ||
-	    ox != 0 ||
+	    gl == NULL ||
+	    (~gl->flags & GRID_LINE_WRAPPED) ||
+	    atx != 0 ||
 	    tty->cx < tty->sx ||
-	    screen_size_x(s) < tty->sx) {
-		if (screen_size_x(s) < tty->sx &&
-		    ox == 0 &&
-		    sx != screen_size_x(s) &&
+	    nx < tty->sx) {
+		if (nx < tty->sx &&
+		    atx == 0 &&
+		    px + sx != nx &&
 		    tty_term_has(tty->term, TTYC_EL1) &&
 		    !tty_fake_bce(tty, wp, 8)) {
 			tty_default_attributes(tty, wp, 8);
-			tty_cursor(tty, screen_size_x(s) - 1, oy + py);
+			tty_cursor(tty, nx - 1, aty);
 			tty_putcode(tty, TTYC_EL1);
 			cleared = 1;
 		}
-		if (sx != 0)
-			tty_cursor(tty, ox, oy + py);
+		if (px + sx != 0)
+			tty_cursor(tty, atx, aty);
 	} else
-		log_debug("%s: wrapped line %u", __func__, oy + py);
+		log_debug("%s: wrapped line %u", __func__, aty);
 
 	memcpy(&last, &grid_default_cell, sizeof last);
 	len = 0;
 	width = 0;
 
 	for (i = 0; i < sx; i++) {
-		grid_view_get_cell(gd, i, py, &gc);
+		grid_view_get_cell(gd, px + i, py, &gc);
 		gcp = tty_check_codeset(tty, &gc);
 		if (len != 0 &&
 		    ((gcp->attr & GRID_ATTR_CHARSET) ||
@@ -984,7 +1255,7 @@ tty_draw_line(struct tty *tty, const struct window_pane *wp,
 		    gcp->attr != last.attr ||
 		    gcp->fg != last.fg ||
 		    gcp->bg != last.bg ||
-		    ux + width + gcp->data.width >= screen_size_x(s) ||
+		    ux + width + gcp->data.width >= nx ||
 		    (sizeof buf) - len < gcp->data.size)) {
 			tty_attributes(tty, &last, wp);
 			tty_putn(tty, buf, len, width);
@@ -998,10 +1269,10 @@ tty_draw_line(struct tty *tty, const struct window_pane *wp,
 			screen_select_cell(s, &last, gcp);
 		else
 			memcpy(&last, gcp, sizeof last);
-		if (ux + gcp->data.width > screen_size_x(s)) {
+		if (ux + gcp->data.width > nx) {
 			tty_attributes(tty, &last, wp);
 			for (j = 0; j < gcp->data.width; j++) {
-				if (ux + j > screen_size_x(s))
+				if (ux + j > nx)
 					break;
 				tty_putc(tty, ' ');
 				ux++;
@@ -1034,10 +1305,9 @@ tty_draw_line(struct tty *tty, const struct window_pane *wp,
 		}
 	}
 
-	if (!cleared && ux < screen_size_x(s)) {
-		nx = screen_size_x(s) - ux;
+	if (!cleared && ux < nx) {
 		tty_default_attributes(tty, wp, 8);
-		tty_clear_line(tty, wp, oy + py, ox + ux, nx, 8);
+		tty_clear_line(tty, wp, aty, atx + ux, nx - ux, 8);
 	}
 
 	tty->flags = (tty->flags & ~TTY_NOCURSOR) | flags;
@@ -1065,17 +1335,18 @@ tty_write(void (*cmdfn)(struct tty *, const struct tty_ctx *),
 	struct window_pane	*wp = ctx->wp;
 	struct client		*c;
 
-	/* wp can be NULL if updating the screen but not the terminal. */
 	if (wp == NULL)
 		return;
-
-	if ((wp->flags & (PANE_REDRAW|PANE_DROP)) || !window_pane_visible(wp))
+	if (wp->flags & (PANE_REDRAW|PANE_DROP))
 		return;
 
 	TAILQ_FOREACH(c, &clients, entry) {
 		if (!tty_client_ready(c, wp))
 			continue;
 
+		ctx->bigger = tty_window_offset(&c->tty, &ctx->ox, &ctx->oy,
+		    &ctx->sx, &ctx->sy);
+
 		ctx->xoff = wp->xoff;
 		ctx->yoff = wp->yoff;
 		if (status_at_line(c) == 0)
@@ -1090,11 +1361,12 @@ tty_cmd_insertcharacter(struct tty *tty, const struct tty_ctx *ctx)
 {
 	struct window_pane	*wp = ctx->wp;
 
-	if (!tty_pane_full_width(tty, ctx) ||
+	if (ctx->bigger ||
+	    !tty_pane_full_width(tty, ctx) ||
 	    tty_fake_bce(tty, wp, ctx->bg) ||
 	    (!tty_term_has(tty->term, TTYC_ICH) &&
 	    !tty_term_has(tty->term, TTYC_ICH1))) {
-		tty_draw_pane(tty, wp, ctx->ocy, ctx->xoff, ctx->yoff);
+		tty_draw_pane(tty, ctx, ctx->ocy);
 		return;
 	}
 
@@ -1110,11 +1382,12 @@ tty_cmd_deletecharacter(struct tty *tty, const struct tty_ctx *ctx)
 {
 	struct window_pane	*wp = ctx->wp;
 
-	if (!tty_pane_full_width(tty, ctx) ||
+	if (ctx->bigger ||
+	    !tty_pane_full_width(tty, ctx) ||
 	    tty_fake_bce(tty, wp, ctx->bg) ||
 	    (!tty_term_has(tty->term, TTYC_DCH) &&
 	    !tty_term_has(tty->term, TTYC_DCH1))) {
-		tty_draw_pane(tty, wp, ctx->ocy, ctx->xoff, ctx->yoff);
+		tty_draw_pane(tty, ctx, ctx->ocy);
 		return;
 	}
 
@@ -1128,6 +1401,11 @@ tty_cmd_deletecharacter(struct tty *tty, const struct tty_ctx *ctx)
 void
 tty_cmd_clearcharacter(struct tty *tty, const struct tty_ctx *ctx)
 {
+	if (ctx->bigger) {
+		tty_draw_pane(tty, ctx, ctx->ocy);
+		return;
+	}
+
 	tty_default_attributes(tty, ctx->wp, ctx->bg);
 
 	tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);
@@ -1142,7 +1420,8 @@ tty_cmd_clearcharacter(struct tty *tty, const struct tty_ctx *ctx)
 void
 tty_cmd_insertline(struct tty *tty, const struct tty_ctx *ctx)
 {
-	if (!tty_pane_full_width(tty, ctx) ||
+	if (ctx->bigger ||
+	    !tty_pane_full_width(tty, ctx) ||
 	    tty_fake_bce(tty, ctx->wp, ctx->bg) ||
 	    !tty_term_has(tty->term, TTYC_CSR) ||
 	    !tty_term_has(tty->term, TTYC_IL1)) {
@@ -1163,7 +1442,8 @@ tty_cmd_insertline(struct tty *tty, const struct tty_ctx *ctx)
 void
 tty_cmd_deleteline(struct tty *tty, const struct tty_ctx *ctx)
 {
-	if (!tty_pane_full_width(tty, ctx) ||
+	if (ctx->bigger ||
+	    !tty_pane_full_width(tty, ctx) ||
 	    tty_fake_bce(tty, ctx->wp, ctx->bg) ||
 	    !tty_term_has(tty->term, TTYC_CSR) ||
 	    !tty_term_has(tty->term, TTYC_DL1)) {
@@ -1190,7 +1470,7 @@ tty_cmd_clearline(struct tty *tty, const struct tty_ctx *ctx)
 	tty_default_attributes(tty, wp, ctx->bg);
 
 	nx = screen_size_x(wp->screen);
-	tty_clear_line(tty, wp, py, ctx->xoff, nx, ctx->bg);
+	tty_clear_pane_line(tty, ctx, py, 0, nx, ctx->bg);
 }
 
 void
@@ -1202,7 +1482,7 @@ tty_cmd_clearendofline(struct tty *tty, const struct tty_ctx *ctx)
 	tty_default_attributes(tty, wp, ctx->bg);
 
 	nx = screen_size_x(wp->screen) - ctx->ocx;
-	tty_clear_line(tty, wp, py, ctx->xoff + ctx->ocx, nx, ctx->bg);
+	tty_clear_pane_line(tty, ctx, py, ctx->ocx, nx, ctx->bg);
 }
 
 void
@@ -1213,7 +1493,7 @@ tty_cmd_clearstartofline(struct tty *tty, const struct tty_ctx *ctx)
 
 	tty_default_attributes(tty, wp, ctx->bg);
 
-	tty_clear_line(tty, wp, py, ctx->xoff, ctx->ocx + 1, ctx->bg);
+	tty_clear_pane_line(tty, ctx, py, 0, ctx->ocx + 1, ctx->bg);
 }
 
 void
@@ -1224,7 +1504,8 @@ tty_cmd_reverseindex(struct tty *tty, const struct tty_ctx *ctx)
 	if (ctx->ocy != ctx->orupper)
 		return;
 
-	if (!tty_pane_full_width(tty, ctx) ||
+	if (ctx->bigger ||
+	    !tty_pane_full_width(tty, ctx) ||
 	    tty_fake_bce(tty, wp, 8) ||
 	    !tty_term_has(tty->term, TTYC_CSR) ||
 	    !tty_term_has(tty->term, TTYC_RI)) {
@@ -1249,7 +1530,8 @@ tty_cmd_linefeed(struct tty *tty, const struct tty_ctx *ctx)
 	if (ctx->ocy != ctx->orlower)
 		return;
 
-	if ((!tty_pane_full_width(tty, ctx) && !tty_use_margin(tty)) ||
+	if (ctx->bigger ||
+	    (!tty_pane_full_width(tty, ctx) && !tty_use_margin(tty)) ||
 	    tty_fake_bce(tty, wp, 8) ||
 	    !tty_term_has(tty->term, TTYC_CSR)) {
 		tty_redraw_region(tty, ctx);
@@ -1285,7 +1567,8 @@ tty_cmd_scrollup(struct tty *tty, const struct tty_ctx *ctx)
 	struct window_pane	*wp = ctx->wp;
 	u_int			 i;
 
-	if ((!tty_pane_full_width(tty, ctx) && !tty_use_margin(tty)) ||
+	if (ctx->bigger ||
+	    (!tty_pane_full_width(tty, ctx) && !tty_use_margin(tty)) ||
 	    tty_fake_bce(tty, wp, 8) ||
 	    !tty_term_has(tty->term, TTYC_CSR)) {
 		tty_redraw_region(tty, ctx);
@@ -1321,18 +1604,18 @@ tty_cmd_clearendofscreen(struct tty *tty, const struct tty_ctx *ctx)
 	tty_region_pane(tty, ctx, 0, screen_size_y(wp->screen) - 1);
 	tty_margin_off(tty);
 
-	px = ctx->xoff;
+	px = 0;
 	nx = screen_size_x(wp->screen);
-	py = ctx->yoff + ctx->ocy + 1;
+	py = ctx->ocy + 1;
 	ny = screen_size_y(wp->screen) - ctx->ocy - 1;
 
-	tty_clear_area(tty, wp, py, ny, px, nx, ctx->bg);
+	tty_clear_pane_area(tty, ctx, py, ny, px, nx, ctx->bg);
 
-	px = ctx->xoff + ctx->ocx;
+	px = ctx->ocx;
 	nx = screen_size_x(wp->screen) - ctx->ocx;
-	py = ctx->yoff + ctx->ocy;
+	py = ctx->ocy;
 
-	tty_clear_line(tty, wp, py, px, nx, ctx->bg);
+	tty_clear_pane_line(tty, ctx, py, px, nx, ctx->bg);
 }
 
 void
@@ -1346,18 +1629,18 @@ tty_cmd_clearstartofscreen(struct tty *tty, const struct tty_ctx *ctx)
 	tty_region_pane(tty, ctx, 0, screen_size_y(wp->screen) - 1);
 	tty_margin_off(tty);
 
-	px = ctx->xoff;
+	px = 0;
 	nx = screen_size_x(wp->screen);
-	py = ctx->yoff;
+	py = 0;
 	ny = ctx->ocy - 1;
 
-	tty_clear_area(tty, wp, py, ny, px, nx, ctx->bg);
+	tty_clear_pane_area(tty, ctx, py, ny, px, nx, ctx->bg);
 
-	px = ctx->xoff;
+	px = 0;
 	nx = ctx->ocx + 1;
-	py = ctx->yoff + ctx->ocy;
+	py = ctx->ocy;
 
-	tty_clear_line(tty, wp, py, px, nx, ctx->bg);
+	tty_clear_pane_line(tty, ctx, py, px, nx, ctx->bg);
 }
 
 void
@@ -1371,12 +1654,12 @@ tty_cmd_clearscreen(struct tty *tty, const struct tty_ctx *ctx)
 	tty_region_pane(tty, ctx, 0, screen_size_y(wp->screen) - 1);
 	tty_margin_off(tty);
 
-	px = ctx->xoff;
+	px = 0;
 	nx = screen_size_x(wp->screen);
-	py = ctx->yoff;
+	py = 0;
 	ny = screen_size_y(wp->screen);
 
-	tty_clear_area(tty, wp, py, ny, px, nx, ctx->bg);
+	tty_clear_pane_area(tty, ctx, py, ny, px, nx, ctx->bg);
 }
 
 void
@@ -1386,6 +1669,11 @@ tty_cmd_alignmenttest(struct tty *tty, const struct tty_ctx *ctx)
 	struct screen		*s = wp->screen;
 	u_int			 i, j;
 
+	if (ctx->bigger) {
+		wp->flags |= PANE_REDRAW;
+		return;
+	}
+
 	tty_attributes(tty, &grid_default_cell, wp);
 
 	tty_region_pane(tty, ctx, 0, screen_size_y(s) - 1);
@@ -1401,7 +1689,11 @@ tty_cmd_alignmenttest(struct tty *tty, const struct tty_ctx *ctx)
 void
 tty_cmd_cell(struct tty *tty, const struct tty_ctx *ctx)
 {
-	if (ctx->xoff + ctx->ocx > tty->sx - 1 && ctx->ocy == ctx->orlower) {
+	if (!tty_is_visible(ctx, ctx->ocx, ctx->ocy, 1, 1))
+		return;
+
+	if (ctx->xoff + ctx->ocx - ctx->ox > tty->sx - 1 &&
+	    ctx->ocy == ctx->orlower) {
 		if (tty_pane_full_width(tty, ctx))
 			tty_region_pane(tty, ctx, ctx->orupper, ctx->orlower);
 		else
@@ -1416,6 +1708,26 @@ tty_cmd_cell(struct tty *tty, const struct tty_ctx *ctx)
 void
 tty_cmd_cells(struct tty *tty, const struct tty_ctx *ctx)
 {
+	struct window_pane	*wp = ctx->wp;
+
+	if (!tty_is_visible(ctx, ctx->ocx, ctx->ocy, ctx->num, 1))
+		return;
+
+	if (ctx->bigger &&
+	    (ctx->ocx < ctx->ox || ctx->ocx + ctx->num > ctx->ox + ctx->sx)) {
+		if (!ctx->wrapped ||
+		    !tty_pane_full_width(tty, ctx) ||
+		    (tty->term->flags & TERM_EARLYWRAP) ||
+		    ctx->xoff + ctx->ocx != 0 ||
+		    ctx->yoff + ctx->ocy != tty->cy + 1 ||
+		    tty->cx < tty->sx ||
+		    tty->cy == tty->rlower)
+			tty_draw_pane(tty, ctx, ctx->ocy);
+		else
+			wp->flags |= PANE_REDRAW;
+		return;
+	}
+
 	tty_cursor_pane_unless_wrap(tty, ctx, ctx->ocx, ctx->ocy);
 
 	tty_attributes(tty, ctx->cell, ctx->wp);
@@ -1533,7 +1845,8 @@ static void
 tty_region_pane(struct tty *tty, const struct tty_ctx *ctx, u_int rupper,
     u_int rlower)
 {
-	tty_region(tty, ctx->yoff + rupper, ctx->yoff + rlower);
+	tty_region(tty, ctx->yoff + rupper - ctx->oy,
+	    ctx->yoff + rlower - ctx->oy);
 }
 
 /* Set region at absolute position. */
@@ -1572,7 +1885,8 @@ tty_margin_off(struct tty *tty)
 static void
 tty_margin_pane(struct tty *tty, const struct tty_ctx *ctx)
 {
-	tty_margin(tty, ctx->xoff, ctx->xoff + ctx->wp->sx - 1);
+	tty_margin(tty, ctx->xoff - ctx->ox,
+	    ctx->xoff + ctx->wp->sx - 1 - ctx->ox);
 }
 
 /* Set margin at absolute position. */
@@ -1623,7 +1937,7 @@ tty_cursor_pane_unless_wrap(struct tty *tty, const struct tty_ctx *ctx,
 static void
 tty_cursor_pane(struct tty *tty, const struct tty_ctx *ctx, u_int cx, u_int cy)
 {
-	tty_cursor(tty, ctx->xoff + cx, ctx->yoff + cy);
+	tty_cursor(tty, ctx->xoff + cx - ctx->ox, ctx->yoff + cy - ctx->oy);
 }
 
 /* Move cursor to absolute position. */