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Instead of working out which pane to resize with the mouse by walking
the panes list, look through the layout cells for the nearest border and
resize that cell. From Dan Aloni in GitHub issue 1374.

/* $OpenBSD: cmd-resize-pane.c,v 1.32 2018/06/08 20:54:22 nicm Exp $ */

/*
 * Copyright (c) 2009 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 <stdlib.h>

#include "tmux.h"

/*
 * Increase or decrease pane size.
 */

static enum cmd_retval	cmd_resize_pane_exec(struct cmd *, struct cmdq_item *);

static void	cmd_resize_pane_mouse_update(struct client *,
		    struct mouse_event *);

const struct cmd_entry cmd_resize_pane_entry = {
	.name = "resize-pane",
	.alias = "resizep",

	.args = { "DLMRt:Ux:y:Z", 0, 1 },
	.usage = "[-DLMRUZ] [-x width] [-y height] " CMD_TARGET_PANE_USAGE " "
		 "[adjustment]",

	.target = { 't', CMD_FIND_PANE, 0 },

	.flags = CMD_AFTERHOOK,
	.exec = cmd_resize_pane_exec
};

static enum cmd_retval
cmd_resize_pane_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args		*args = self->args;
	struct cmdq_shared	*shared = item->shared;
	struct window_pane	*wp = item->target.wp;
	struct winlink		*wl = item->target.wl;
	struct window		*w = wl->window;
	struct client		*c = item->client;
	struct session		*s = item->target.s;
	const char	       	*errstr;
	char			*cause;
	u_int			 adjust;
	int			 x, y;

	if (args_has(args, 'M')) {
		if (cmd_mouse_window(&shared->mouse, &s) == NULL)
			return (CMD_RETURN_NORMAL);
		if (c == NULL || c->session != s)
			return (CMD_RETURN_NORMAL);
		c->tty.mouse_drag_update = cmd_resize_pane_mouse_update;
		cmd_resize_pane_mouse_update(c, &shared->mouse);
		return (CMD_RETURN_NORMAL);
	}

	if (args_has(args, 'Z')) {
		if (w->flags & WINDOW_ZOOMED)
			window_unzoom(w);
		else
			window_zoom(wp);
		server_redraw_window(w);
		server_status_window(w);
		return (CMD_RETURN_NORMAL);
	}
	server_unzoom_window(w);

	if (args->argc == 0)
		adjust = 1;
	else {
		adjust = strtonum(args->argv[0], 1, INT_MAX, &errstr);
		if (errstr != NULL) {
			cmdq_error(item, "adjustment %s", errstr);
			return (CMD_RETURN_ERROR);
		}
	}

	if (args_has(self->args, 'x')) {
		x = args_strtonum(self->args, 'x', PANE_MINIMUM, INT_MAX,
		    &cause);
		if (cause != NULL) {
			cmdq_error(item, "width %s", cause);
			free(cause);
			return (CMD_RETURN_ERROR);
		}
		layout_resize_pane_to(wp, LAYOUT_LEFTRIGHT, x);
	}
	if (args_has(self->args, 'y')) {
		y = args_strtonum(self->args, 'y', PANE_MINIMUM, INT_MAX,
		    &cause);
		if (cause != NULL) {
			cmdq_error(item, "height %s", cause);
			free(cause);
			return (CMD_RETURN_ERROR);
		}
		layout_resize_pane_to(wp, LAYOUT_TOPBOTTOM, y);
	}

	if (args_has(self->args, 'L'))
		layout_resize_pane(wp, LAYOUT_LEFTRIGHT, -adjust, 1);
	else if (args_has(self->args, 'R'))
		layout_resize_pane(wp, LAYOUT_LEFTRIGHT, adjust, 1);
	else if (args_has(self->args, 'U'))
		layout_resize_pane(wp, LAYOUT_TOPBOTTOM, -adjust, 1);
	else if (args_has(self->args, 'D'))
		layout_resize_pane(wp, LAYOUT_TOPBOTTOM, adjust, 1);
	server_redraw_window(wl->window);

	return (CMD_RETURN_NORMAL);
}

static void
cmd_resize_pane_mouse_update(struct client *c, struct mouse_event *m)
{
	struct winlink		*wl;
	struct window		*w;
	u_int			 y, ly, x, lx;
	struct layout_cell	*lc;

	wl = cmd_mouse_window(m, NULL);
	if (wl == NULL) {
		c->tty.mouse_drag_update = NULL;
		return;
	}
	w = wl->window;

	y = m->y; x = m->x;
	if (m->statusat == 0 && y > 0)
		y--;
	else if (m->statusat > 0 && y >= (u_int)m->statusat)
		y = m->statusat - 1;
	ly = m->ly; lx = m->lx;
	if (m->statusat == 0 && ly > 0)
		ly--;
	else if (m->statusat > 0 && ly >= (u_int)m->statusat)
		ly = m->statusat - 1;

	lc = layout_search_by_border(w->layout_root, lx, ly);
	if (lc == NULL)
		return;

	if (y != ly && lc->parent->type == LAYOUT_TOPBOTTOM)
		layout_resize_layout(w, lc, LAYOUT_TOPBOTTOM, y - ly, 0);
	else if (x != lx && lc->parent->type == LAYOUT_LEFTRIGHT)
		layout_resize_layout(w, lc, LAYOUT_LEFTRIGHT, x - lx, 0);
	else
		return;

	server_redraw_window(w);
}