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Move lazy resize from the pane to the window, there is no point in
resizing the window unless it is the current window, and if we do and
don't resize the pane until later there are problems if the size changes
from A to B then back to A.

/* $OpenBSD: resize.c,v 1.40 2020/05/16 16:50:55 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <string.h>

#include "tmux.h"

void
resize_window(struct window *w, u_int sx, u_int sy, int xpixel, int ypixel)
{
	int	zoomed;

	/* Check size limits. */
	if (sx < WINDOW_MINIMUM)
		sx = WINDOW_MINIMUM;
	if (sx > WINDOW_MAXIMUM)
		sx = WINDOW_MAXIMUM;
	if (sy < WINDOW_MINIMUM)
		sy = WINDOW_MINIMUM;
	if (sy > WINDOW_MAXIMUM)
		sy = WINDOW_MAXIMUM;

	/* If the window is zoomed, unzoom. */
	zoomed = w->flags & WINDOW_ZOOMED;
	if (zoomed)
		window_unzoom(w);

	/* Resize the layout first. */
	layout_resize(w, sx, sy);

	/* Resize the window, it can be no smaller than the layout. */
	if (sx < w->layout_root->sx)
		sx = w->layout_root->sx;
	if (sy < w->layout_root->sy)
		sy = w->layout_root->sy;
	window_resize(w, sx, sy, xpixel, ypixel);
	log_debug("%s: @%u resized to %u,%u; layout %u,%u", __func__, w->id,
	    sx, sy, w->layout_root->sx, w->layout_root->sy);

	/* Restore the window zoom state. */
	if (zoomed)
		window_zoom(w->active);

	tty_update_window_offset(w);
	server_redraw_window(w);
	notify_window("window-layout-changed", w);
	w->flags &= ~WINDOW_RESIZE;
}

static int
ignore_client_size(struct client *c)
{
	struct client	*loop;

	if (c->session == NULL)
		return (1);
	if (c->flags & CLIENT_NOSIZEFLAGS)
		return (1);
	if (c->flags & CLIENT_IGNORESIZE) {
		/*
		 * Ignore flagged clients if there are any attached clients
		 * that aren't flagged.
		 */
		TAILQ_FOREACH (loop, &clients, entry) {
			if (loop->session == NULL)
				continue;
			if (loop->flags & CLIENT_NOSIZEFLAGS)
				continue;
			if (~loop->flags & CLIENT_IGNORESIZE)
				return (1);
		}
	}
	if ((c->flags & CLIENT_CONTROL) && (~c->flags & CLIENT_SIZECHANGED))
		return (1);
	return (0);
}

void
default_window_size(struct client *c, struct session *s, struct window *w,
    u_int *sx, u_int *sy, u_int *xpixel, u_int *ypixel, int type)
{
	struct client	*loop;
	u_int		 cx, cy, n;
	const char	*value;

	if (type == -1)
		type = options_get_number(global_w_options, "window-size");
	switch (type) {
	case WINDOW_SIZE_LARGEST:
		*sx = *sy = 0;
		*xpixel = *ypixel = 0;
		TAILQ_FOREACH(loop, &clients, entry) {
			if (ignore_client_size(loop))
				continue;
			if (w != NULL && !session_has(loop->session, w))
				continue;
			if (w == NULL && loop->session != s)
				continue;

			cx = loop->tty.sx;
			cy = loop->tty.sy - status_line_size(loop);

			if (cx > *sx)
				*sx = cx;
			if (cy > *sy)
				*sy = cy;

			if (loop->tty.xpixel > *xpixel &&
			    loop->tty.ypixel > *ypixel) {
				*xpixel = loop->tty.xpixel;
				*ypixel = loop->tty.ypixel;
			}
		}
		if (*sx == 0 || *sy == 0)
			goto manual;
		break;
	case WINDOW_SIZE_SMALLEST:
		*sx = *sy = UINT_MAX;
		*xpixel = *ypixel = 0;
		TAILQ_FOREACH(loop, &clients, entry) {
			if (ignore_client_size(loop))
				continue;
			if (w != NULL && !session_has(loop->session, w))
				continue;
			if (w == NULL && loop->session != s)
				continue;

			cx = loop->tty.sx;
			cy = loop->tty.sy - status_line_size(loop);

			if (cx < *sx)
				*sx = cx;
			if (cy < *sy)
				*sy = cy;

			if (loop->tty.xpixel > *xpixel &&
			    loop->tty.ypixel > *ypixel) {
				*xpixel = loop->tty.xpixel;
				*ypixel = loop->tty.ypixel;
			}
		}
		if (*sx == UINT_MAX || *sy == UINT_MAX)
			goto manual;
		break;
	case WINDOW_SIZE_LATEST:
		if (c != NULL && !ignore_client_size(c)) {
			*sx = c->tty.sx;
			*sy = c->tty.sy - status_line_size(c);
			*xpixel = c->tty.xpixel;
		        *ypixel = c->tty.ypixel;
		} else {
			if (w == NULL)
				goto manual;
			n = 0;
			TAILQ_FOREACH(loop, &clients, entry) {
				if (!ignore_client_size(loop) &&
				    session_has(loop->session, w)) {
					if (++n > 1)
						break;
				}
			}
			*sx = *sy = UINT_MAX;
			*xpixel = *ypixel = 0;
			TAILQ_FOREACH(loop, &clients, entry) {
				if (ignore_client_size(loop))
					continue;
				if (n > 1 && loop != w->latest)
					continue;
				s = loop->session;

				cx = loop->tty.sx;
				cy = loop->tty.sy - status_line_size(loop);

				if (cx < *sx)
					*sx = cx;
				if (cy < *sy)
					*sy = cy;

				if (loop->tty.xpixel > *xpixel &&
				    loop->tty.ypixel > *ypixel) {
					*xpixel = loop->tty.xpixel;
					*ypixel = loop->tty.ypixel;
				}
			}
			if (*sx == UINT_MAX || *sy == UINT_MAX)
				goto manual;
		}
		break;
	case WINDOW_SIZE_MANUAL:
		goto manual;
	}
	goto done;

manual:
	value = options_get_string(s->options, "default-size");
	if (sscanf(value, "%ux%u", sx, sy) != 2) {
		*sx = 80;
		*sy = 24;
	}

done:
	if (*sx < WINDOW_MINIMUM)
		*sx = WINDOW_MINIMUM;
	if (*sx > WINDOW_MAXIMUM)
		*sx = WINDOW_MAXIMUM;
	if (*sy < WINDOW_MINIMUM)
		*sy = WINDOW_MINIMUM;
	if (*sy > WINDOW_MAXIMUM)
		*sy = WINDOW_MAXIMUM;
}

void
recalculate_size(struct window *w)
{
	struct session	*s;
	struct client	*c;
	u_int		 sx, sy, cx, cy, xpixel = 0, ypixel = 0, n;
	int		 type, current, has, changed;

	if (w->active == NULL)
		return;
	log_debug("%s: @%u is %u,%u", __func__, w->id, w->sx, w->sy);

	type = options_get_number(w->options, "window-size");
	current = options_get_number(w->options, "aggressive-resize");

	changed = 1;
	switch (type) {
	case WINDOW_SIZE_LARGEST:
		sx = sy = 0;
		TAILQ_FOREACH(c, &clients, entry) {
			if (ignore_client_size(c))
				continue;
			s = c->session;

			if (current)
				has = (s->curw->window == w);
			else
				has = session_has(s, w);
			if (!has)
				continue;

			cx = c->tty.sx;
			cy = c->tty.sy - status_line_size(c);

			if (cx > sx)
				sx = cx;
			if (cy > sy)
				sy = cy;

			if (c->tty.xpixel > xpixel && c->tty.ypixel > ypixel) {
				xpixel = c->tty.xpixel;
				ypixel = c->tty.ypixel;
			}
		}
		if (sx == 0 || sy == 0)
			changed = 0;
		break;
	case WINDOW_SIZE_SMALLEST:
		sx = sy = UINT_MAX;
		TAILQ_FOREACH(c, &clients, entry) {
			if (ignore_client_size(c))
				continue;
			s = c->session;

			if (current)
				has = (s->curw->window == w);
			else
				has = session_has(s, w);
			if (!has)
				continue;

			cx = c->tty.sx;
			cy = c->tty.sy - status_line_size(c);

			if (cx < sx)
				sx = cx;
			if (cy < sy)
				sy = cy;

			if (c->tty.xpixel > xpixel && c->tty.ypixel > ypixel) {
				xpixel = c->tty.xpixel;
				ypixel = c->tty.ypixel;
			}
		}
		if (sx == UINT_MAX || sy == UINT_MAX)
			changed = 0;
		break;
	case WINDOW_SIZE_LATEST:
		n = 0;
		TAILQ_FOREACH(c, &clients, entry) {
			if (!ignore_client_size(c) &&
			    session_has(c->session, w)) {
				if (++n > 1)
					break;
			}
		}
		sx = sy = UINT_MAX;
		TAILQ_FOREACH(c, &clients, entry) {
			if (ignore_client_size(c))
				continue;
			if (n > 1 && c != w->latest)
				continue;
			s = c->session;

			if (current)
				has = (s->curw->window == w);
			else
				has = session_has(s, w);
			if (!has)
				continue;

			cx = c->tty.sx;
			cy = c->tty.sy - status_line_size(c);

			if (cx < sx)
				sx = cx;
			if (cy < sy)
				sy = cy;

			if (c->tty.xpixel > xpixel && c->tty.ypixel > ypixel) {
				xpixel = c->tty.xpixel;
				ypixel = c->tty.ypixel;
			}
		}
		if (sx == UINT_MAX || sy == UINT_MAX)
			changed = 0;
		break;
	case WINDOW_SIZE_MANUAL:
		changed = 0;
		break;
	}
	if (w->flags & WINDOW_RESIZE) {
		if (changed && w->new_sx == sx && w->new_sy == sy)
			changed = 0;
	} else {
		if (changed && w->sx == sx && w->sy == sy)
			changed = 0;
	}

	if (!changed) {
		tty_update_window_offset(w);
		return;
	}
	log_debug("%s: @%u new size %u,%u", __func__, w->id, sx, sy);
	if (type == WINDOW_SIZE_MANUAL)
		resize_window(w, sx, sy, xpixel, ypixel);
	else {
		w->new_sx = sx;
		w->new_sy = sy;
		w->new_xpixel = xpixel;
		w->new_ypixel = ypixel;

		w->flags |= WINDOW_RESIZE;
		tty_update_window_offset(w);
	}
}

void
recalculate_sizes(void)
{
	struct session	*s;
	struct client	*c;
	struct window	*w;

	/*
	 * Clear attached count and update saved status line information for
	 * each session.
	 */
	RB_FOREACH(s, sessions, &sessions) {
		s->attached = 0;
		status_update_cache(s);
	}

	/*
	 * Increment attached count and check the status line size for each
	 * client.
	 */
	TAILQ_FOREACH(c, &clients, entry) {
		s = c->session;
		if (s != NULL && !(c->flags & CLIENT_UNATTACHEDFLAGS))
			s->attached++;
		if (ignore_client_size(c))
			continue;
		if (c->tty.sy <= s->statuslines || (c->flags & CLIENT_CONTROL))
			c->flags |= CLIENT_STATUSOFF;
		else
			c->flags &= ~CLIENT_STATUSOFF;
	}

	/* Walk each window and adjust the size. */
	RB_FOREACH(w, windows, &windows)
		recalculate_size(w);
}