diff --git a/runtime/doc/popup.txt b/runtime/doc/popup.txt
index 0552951..b58ade6 100644
--- a/runtime/doc/popup.txt
+++ b/runtime/doc/popup.txt
@@ -1,4 +1,4 @@
-*popup.txt*  For Vim version 8.1.  Last change: 2019 Jul 28
+*popup.txt*  For Vim version 8.1.  Last change: 2019 Aug 01
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -434,6 +434,7 @@
 			callback
 			close
 			drag
+			resize
 			cursorline
 			filter
 			firstline
@@ -542,6 +543,9 @@
 			popup does not have a border. As soon as dragging
 			starts and "pos" is "center" it is changed to
 			"topleft".
+	resize		TRUE to allow the popup to be resized with the mouse
+			by grabbing at at the bottom right cornder.  Has no
+			effect if the popup does not have a border.
 	close		When "button" an X is displayed in the top-right, on
 			top of any border, padding or text.  When clicked on
 			the X the popup will close.  Any callback is invoked
diff --git a/src/popupwin.c b/src/popupwin.c
index ed01693..9a39693 100644
--- a/src/popupwin.c
+++ b/src/popupwin.c
@@ -235,13 +235,14 @@
 static int drag_start_col;
 static int drag_start_wantline;
 static int drag_start_wantcol;
+static int drag_on_resize_handle;
 
 /*
  * Mouse down on border of popup window: start dragging it.
  * Uses mouse_col and mouse_row.
  */
     void
-popup_start_drag(win_T *wp)
+popup_start_drag(win_T *wp, int row, int col)
 {
     drag_start_row = mouse_row;
     drag_start_col = mouse_col;
@@ -258,10 +259,26 @@
     // Stop centering the popup
     if (wp->w_popup_pos == POPPOS_CENTER)
 	wp->w_popup_pos = POPPOS_TOPLEFT;
+
+    drag_on_resize_handle = wp->w_popup_border[1] > 0
+			    && wp->w_popup_border[2] > 0
+			    && row == popup_height(wp) - 1
+			    && col == popup_width(wp) - 1;
+
+    if (wp->w_popup_pos != POPPOS_TOPLEFT && drag_on_resize_handle)
+    {
+	if (wp->w_popup_pos == POPPOS_TOPRIGHT
+		|| wp->w_popup_pos == POPPOS_BOTRIGHT)
+	    wp->w_wantcol = wp->w_wincol + 1;
+	if (wp->w_popup_pos == POPPOS_BOTLEFT)
+	    wp->w_wantline = wp->w_winrow + 1;
+	wp->w_popup_pos = POPPOS_TOPLEFT;
+    }
 }
 
 /*
- * Mouse moved while dragging a popup window: adjust the window popup position.
+ * Mouse moved while dragging a popup window: adjust the window popup position
+ * or resize.
  */
     void
 popup_drag(win_T *wp)
@@ -270,6 +287,39 @@
     if (!win_valid_popup(wp))
 	return;
 
+    if ((wp->w_popup_flags & POPF_RESIZE) && drag_on_resize_handle)
+    {
+	int width_inc = mouse_col - drag_start_col;
+	int height_inc = mouse_row - drag_start_row;
+
+	if (width_inc != 0)
+	{
+	    int width = wp->w_width + width_inc;
+
+	    if (width < 1)
+		width = 1;
+	    wp->w_minwidth = width;
+	    wp->w_maxwidth = width;
+	    drag_start_col = mouse_col;
+	}
+
+	if (height_inc != 0)
+	{
+	    int height = wp->w_height + height_inc;
+
+	    if (height < 1)
+		height = 1;
+	    wp->w_minheight = height;
+	    wp->w_maxheight = height;
+	    drag_start_row = mouse_row;
+	}
+
+	popup_adjust_position(wp);
+	return;
+    }
+
+    if (!(wp->w_popup_flags & POPF_DRAG))
+	return;
     wp->w_wantline = drag_start_wantline + (mouse_row - drag_start_row);
     if (wp->w_wantline < 1)
 	wp->w_wantline = 1;
@@ -550,7 +600,23 @@
 
     di = dict_find(dict, (char_u *)"drag", -1);
     if (di != NULL)
-	wp->w_popup_drag = dict_get_number(dict, (char_u *)"drag");
+    {
+	nr = dict_get_number(dict, (char_u *)"drag");
+	if (nr)
+	    wp->w_popup_flags |= POPF_DRAG;
+	else
+	    wp->w_popup_flags &= ~POPF_DRAG;
+    }
+
+    di = dict_find(dict, (char_u *)"resize", -1);
+    if (di != NULL)
+    {
+	nr = dict_get_number(dict, (char_u *)"resize");
+	if (nr)
+	    wp->w_popup_flags |= POPF_RESIZE;
+	else
+	    wp->w_popup_flags &= ~POPF_RESIZE;
+    }
 
     di = dict_find(dict, (char_u *)"close", -1);
     if (di != NULL)
@@ -1477,7 +1543,7 @@
 	wp->w_wantcol = 10;
 	wp->w_zindex = POPUPWIN_NOTIFICATION_ZINDEX;
 	wp->w_minwidth = 20;
-	wp->w_popup_drag = 1;
+	wp->w_popup_flags |= POPF_DRAG;
 	wp->w_popup_close = POPCLOSE_CLICK;
 	for (i = 0; i < 4; ++i)
 	    wp->w_popup_border[i] = 1;
@@ -1494,7 +1560,7 @@
     {
 	wp->w_popup_pos = POPPOS_CENTER;
 	wp->w_zindex = POPUPWIN_DIALOG_ZINDEX;
-	wp->w_popup_drag = 1;
+	wp->w_popup_flags |= POPF_DRAG;
 	for (i = 0; i < 4; ++i)
 	{
 	    wp->w_popup_border[i] = 1;
@@ -1519,7 +1585,7 @@
 
     if (type == TYPE_PREVIEW)
     {
-	wp->w_popup_drag = 1;
+	wp->w_popup_flags |= POPF_DRAG | POPF_RESIZE;
 	wp->w_popup_close = POPCLOSE_BUTTON;
 	for (i = 0; i < 4; ++i)
 	    wp->w_popup_border[i] = 1;
@@ -1707,7 +1773,7 @@
     int	row = mouse_row;
     int	col = mouse_col;
 
-    if (wp->w_popup_drag
+    if ((wp->w_popup_flags & POPF_DRAG)
 	    && is_mouse_key(c)
 	    && (wp == popup_dragwin
 			  || wp == mouse_find_win(&row, &col, FIND_POPUP)))
@@ -2244,7 +2310,8 @@
 	dict_add_number(dict, "fixed", wp->w_popup_fixed);
 	dict_add_string(dict, "title", wp->w_popup_title);
 	dict_add_number(dict, "wrap", wp->w_p_wrap);
-	dict_add_number(dict, "drag", wp->w_popup_drag);
+	dict_add_number(dict, "drag", (wp->w_popup_flags & POPF_DRAG) != 0);
+	dict_add_number(dict, "resize", (wp->w_popup_flags & POPF_RESIZE) != 0);
 	dict_add_number(dict, "cursorline",
 				   (wp->w_popup_flags & POPF_CURSORLINE) != 0);
 	dict_add_string(dict, "highlight", wp->w_p_wcr);
@@ -2811,7 +2878,8 @@
 	    border_char[1] = border_char[3] = 0x2551;
 	    border_char[4] = 0x2554;
 	    border_char[5] = 0x2557;
-	    border_char[6] = 0x255d;
+	    border_char[6] = (wp->w_popup_flags & POPF_RESIZE)
+							     ? 0x21f2 : 0x255d;
 	    border_char[7] = 0x255a;
 	}
 	else
@@ -2820,6 +2888,8 @@
 	    border_char[1] = border_char[3] = '|';
 	    for (i = 4; i < 8; ++i)
 		border_char[i] = '+';
+	    if (wp->w_popup_flags & POPF_RESIZE)
+		border_char[6] = '@';
 	}
 	for (i = 0; i < 8; ++i)
 	    if (wp->w_border_char[i] != 0)
diff --git a/src/structs.h b/src/structs.h
index 21b5f69..7a21d27 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -3017,7 +3017,6 @@
     int		w_popup_mouse_row;  // close popup if mouse moves away
     int		w_popup_mouse_mincol;  // close popup if mouse moves away
     int		w_popup_mouse_maxcol;  // close popup if mouse moves away
-    int		w_popup_drag;	    // allow moving the popup with the mouse
     popclose_T	w_popup_close;	    // allow closing the popup with the mouse
 
     list_T	*w_popup_mask;	     // list of lists for "mask"
diff --git a/src/testdir/dumps/Test_popupwin_drag_01.dump b/src/testdir/dumps/Test_popupwin_drag_01.dump
index c8867e3..64afe82 100644
--- a/src/testdir/dumps/Test_popupwin_drag_01.dump
+++ b/src/testdir/dumps/Test_popupwin_drag_01.dump
@@ -7,4 +7,4 @@
 |7| @31|║+0#0000001#ffd7ff255|1@3| @1|║| +0#0000000#ffffff0@33
 |8| @31|║+0#0000001#ffd7ff255|2@5|║| +0#0000000#ffffff0@33
 |9| @31|║+0#0000001#ffd7ff255|3@4| |║| +0#0000000#ffffff0@33
-@33|╚+0#0000001#ffd7ff255|═@5|╝| +0#0000000#ffffff0@15|1|,|1| @10|T|o|p| 
+@33|╚+0#0000001#ffd7ff255|═@5|⇲| +0#0000000#ffffff0@15|1|,|1| @10|T|o|p| 
diff --git a/src/testdir/dumps/Test_popupwin_drag_02.dump b/src/testdir/dumps/Test_popupwin_drag_02.dump
index f03ecb8..2597e1d 100644
--- a/src/testdir/dumps/Test_popupwin_drag_02.dump
+++ b/src/testdir/dumps/Test_popupwin_drag_02.dump
@@ -3,7 +3,7 @@
 |3| @31|║+0#0000001#ffd7ff255|1@3| @1|║| +0#0000000#ffffff0@33
 |4| @31|║+0#0000001#ffd7ff255|2@5|║| +0#0000000#ffffff0@33
 |5| @31|║+0#0000001#ffd7ff255|3@4| |║| +0#0000000#ffffff0@33
-|6| @31|╚+0#0000001#ffd7ff255|═@5|╝| +0#0000000#ffffff0@33
+|6| @31|╚+0#0000001#ffd7ff255|═@5|⇲| +0#0000000#ffffff0@33
 |7| @73
 |8| @73
 |9| @73
diff --git a/src/testdir/dumps/Test_popupwin_drag_03.dump b/src/testdir/dumps/Test_popupwin_drag_03.dump
new file mode 100644
index 0000000..b6b363a
--- /dev/null
+++ b/src/testdir/dumps/Test_popupwin_drag_03.dump
@@ -0,0 +1,10 @@
+>1+0&#ffffff0| @73
+|2| @31|╔+0#0000001#ffd7ff255|═@9|╗| +0#0000000#ffffff0@29
+|3| @31|║+0#0000001#ffd7ff255|1@3| @5|║| +0#0000000#ffffff0@29
+|4| @31|║+0#0000001#ffd7ff255|2@5| @3|║| +0#0000000#ffffff0@29
+|5| @31|║+0#0000001#ffd7ff255|3@4| @4|║| +0#0000000#ffffff0@29
+|6| @31|║+0#0000001#ffd7ff255| +0#4040ff13&@9|║+0#0000001&| +0#0000000#ffffff0@29
+|7| @31|╚+0#0000001#ffd7ff255|═@9|⇲| +0#0000000#ffffff0@29
+|8| @73
+|9| @73
+|:|c|a|l@1| |R|e|s|i|z|e|(|)| @42|1|,|1| @10|T|o|p| 
diff --git a/src/testdir/dumps/Test_popupwin_previewpopup_1.dump b/src/testdir/dumps/Test_popupwin_previewpopup_1.dump
index 06ac4cb..1b87292 100644
--- a/src/testdir/dumps/Test_popupwin_previewpopup_1.dump
+++ b/src/testdir/dumps/Test_popupwin_previewpopup_1.dump
@@ -4,7 +4,7 @@
 |f|o|u|r| |║+0#0000001#ffd7ff255|t|h|e|w|o|r|d| |i|s| |h|e|r|e| @24| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255| +0#0000000#ffffff0@26
 |f|i|v|e| |║+0#0000001#ffd7ff255|2@1| @37| +0#0000000#0000001|║+0#0000001#ffd7ff255| +0#0000000#ffffff0@26
 |s|i|x| @1|║+0#0000001#ffd7ff255|2|3| @37| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255| +0#0000000#ffffff0@26
-|s|e|v|e|n|╚+0#0000001#ffd7ff255|═@40|╝| +0#0000000#ffffff0@26
+|s|e|v|e|n|╚+0#0000001#ffd7ff255|═@40|⇲| +0#0000000#ffffff0@26
 |f|i|n|d| >t|h|e|w|o|r|d| |s|o|m|e|w|h|e|r|e| @52
 |n|i|n|e| @70
 |t|h|i|s| |i|s| |a|n|o|t|h|e|r| |w|o|r|d| @54
diff --git a/src/testdir/dumps/Test_popupwin_previewpopup_2.dump b/src/testdir/dumps/Test_popupwin_previewpopup_2.dump
index aa53bb3..131eabe 100644
--- a/src/testdir/dumps/Test_popupwin_previewpopup_2.dump
+++ b/src/testdir/dumps/Test_popupwin_previewpopup_2.dump
@@ -6,7 +6,7 @@
 |s|i|x| @4|║+0#0000001#ffd7ff255|t|h|i|s| |i|s| |a|n|o|t|h|e|r| |p|l|a|c|e| @18| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255| +0#0000000#ffffff0@23
 |s|e|v|e|n| @2|║+0#0000001#ffd7ff255|2|9| @37| +0#0000000#0000001|║+0#0000001#ffd7ff255| +0#0000000#ffffff0@23
 |f|i|n|d| |t|h|e|║+0#0000001#ffd7ff255|3|0| @37| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255| +0#0000000#ffffff0@23
-|n|i|n|e| @3|╚+0#0000001#ffd7ff255|═@40|╝| +0#0000000#ffffff0@23
+|n|i|n|e| @3|╚+0#0000001#ffd7ff255|═@40|⇲| +0#0000000#ffffff0@23
 |t|h|i|s| |i|s| >a|n|o|t|h|e|r| |w|o|r|d| @54
 |v|e|r|y| |l|o|n|g| |l|i|n|e| |w|h|e|r|e| |t|h|e| |w|o|r|d| |i|s| |a|l|s|o| |a|n|o|t|h|e|r| @29
 |~+0#4040ff13&| @73
diff --git a/src/testdir/dumps/Test_popupwin_previewpopup_3.dump b/src/testdir/dumps/Test_popupwin_previewpopup_3.dump
index c4ae417..46a3a61 100644
--- a/src/testdir/dumps/Test_popupwin_previewpopup_3.dump
+++ b/src/testdir/dumps/Test_popupwin_previewpopup_3.dump
@@ -6,7 +6,7 @@
 |s|i|x| @10|║+0#0000001#ffd7ff255|t|h|i|s| |i|s| |a|n|o|t|h|e|r| |p|l|a|c|e| @18| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255| +0#0000000#ffffff0@17
 |s|e|v|e|n| @8|║+0#0000001#ffd7ff255|2|9| @37| +0#0000000#0000001|║+0#0000001#ffd7ff255| +0#0000000#ffffff0@17
 |f|i|n|d| |t|h|e|w|o|r|d| |s|║+0#0000001#ffd7ff255|3|0| @37| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255| +0#0000000#ffffff0@17
-|n|i|n|e| @9|╚+0#0000001#ffd7ff255|═@40|╝| +0#0000000#ffffff0@17
+|n|i|n|e| @9|╚+0#0000001#ffd7ff255|═@40|⇲| +0#0000000#ffffff0@17
 |t|h|i|s| |i|s| >a|n|o|t|h|e|r| |w|o|r|d| @54
 |v|e|r|y| |l|o|n|g| |l|i|n|e| |w|h|e|r|e| |t|h|e| |w|o|r|d| |i|s| |a|l|s|o| |a|n|o|t|h|e|r| @29
 |~+0#4040ff13&| @73
diff --git a/src/testdir/dumps/Test_popupwin_previewpopup_4.dump b/src/testdir/dumps/Test_popupwin_previewpopup_4.dump
index fc63507..de67fa3 100644
--- a/src/testdir/dumps/Test_popupwin_previewpopup_4.dump
+++ b/src/testdir/dumps/Test_popupwin_previewpopup_4.dump
@@ -7,7 +7,7 @@
 |s+0#0000000#ffffff0|e|v|e|n| @26|║+0#0000001#ffd7ff255|t|h|i|s| |i|s| |a|n|o|t|h|e|r| |p|l|a|c|e| @18| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255
 |f+0#0000000#ffffff0|i|n|d| |t|h|e|w|o|r|d| |s|o|m|e|w|h|e|r|e| @9|║+0#0000001#ffd7ff255|2|9| @37| +0#0000000#0000001|║+0#0000001#ffd7ff255
 |n+0#0000000#ffffff0|i|n|e| @27|║+0#0000001#ffd7ff255|3|0| @37| +0#0000000#a8a8a8255|║+0#0000001#ffd7ff255
-|t+0#0000000#ffffff0|h|i|s| |i|s| |a|n|o|t|h|e|r| |w|o|r|d| @11|╚+0#0000001#ffd7ff255|═@40|╝
+|t+0#0000000#ffffff0|h|i|s| |i|s| |a|n|o|t|h|e|r| |w|o|r|d| @11|╚+0#0000001#ffd7ff255|═@40|⇲
 |v+0#0000000#ffffff0|e|r|y| |l|o|n|g| |l|i|n|e| |w|h|e|r|e| |t|h|e| |w|o|r|d| |i|s| |a|l|s|o| >a|n|o|t|h|e|r| @29
 |~+0#4040ff13&| @73
 |~| @73
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 6033be6..d4b98ae 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -354,6 +354,7 @@
 	call setline(1, range(1, 20))
 	let winid = popup_create(['1111', '222222', '33333'], #{
 	      \ drag: 1,
+	      \ resize: 1,
 	      \ border: [],
 	      \ line: &lines - 4,
 	      \ })
@@ -362,6 +363,11 @@
 	endfunc
 	map <silent> <F3> :call test_setmouse(&lines - 4, &columns / 2)<CR>
 	map <silent> <F4> :call test_setmouse(&lines - 8, &columns / 2)<CR>
+	func Resize()
+	  call feedkeys("\<F5>\<LeftMouse>\<F6>\<LeftDrag>\<LeftRelease>", "xt")
+	endfunc
+	map <silent> <F5> :call test_setmouse(6, 41)<CR>
+	map <silent> <F6> :call test_setmouse(7, 45)<CR>
   END
   call writefile(lines, 'XtestPopupDrag')
   let buf = RunVimInTerminal('-S XtestPopupDrag', #{rows: 10})
@@ -370,6 +376,9 @@
   call term_sendkeys(buf, ":call Dragit()\<CR>")
   call VerifyScreenDump(buf, 'Test_popupwin_drag_02', {})
 
+  call term_sendkeys(buf, ":call Resize()\<CR>")
+  call VerifyScreenDump(buf, 'Test_popupwin_drag_03', {})
+
   " clean up
   call StopVimInTerminal(buf)
   call delete('XtestPopupDrag')
diff --git a/src/ui.c b/src/ui.c
index 4e05859..c8cedb9 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -3067,10 +3067,11 @@
 		popup_close_for_mouse_click(wp);
 		return IN_UNKNOWN;
 	    }
-	    else if (wp->w_popup_drag && popup_on_border(wp, row, col))
+	    else if ((wp->w_popup_flags & (POPF_DRAG | POPF_RESIZE))
+					      && popup_on_border(wp, row, col))
 	    {
 		popup_dragwin = wp;
-		popup_start_drag(wp);
+		popup_start_drag(wp, row, col);
 		return IN_UNKNOWN;
 	    }
 	    // Only close on release, otherwise it's not possible to drag or do
diff --git a/src/version.c b/src/version.c
index 0e30df7..8ec7b41 100644
--- a/src/version.c
+++ b/src/version.c
@@ -774,6 +774,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1787,
+/**/
     1786,
 /**/
     1785,
diff --git a/src/vim.h b/src/vim.h
index 9d7ecf6..99ffc10 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -614,11 +614,13 @@
 #define VALID_TOPLINE	0x80	// w_topline is valid (for cursor position)
 
 // Values for w_popup_flags.
-#define POPF_IS_POPUP	1	// this is a popup window
-#define POPF_HIDDEN	2	// popup is not displayed
-#define POPF_HANDLED	4	// popup was just redrawn or filtered
-#define POPF_CURSORLINE	8	// popup is highlighting at the cursorline
-#define POPF_ON_CMDLINE	16	// popup overlaps command line
+#define POPF_IS_POPUP	0x01	// this is a popup window
+#define POPF_HIDDEN	0x02	// popup is not displayed
+#define POPF_HANDLED	0x04	// popup was just redrawn or filtered
+#define POPF_CURSORLINE	0x08	// popup is highlighting at the cursorline
+#define POPF_ON_CMDLINE	0x10	// popup overlaps command line
+#define POPF_DRAG	0x20	// popup can be moved by dragging
+#define POPF_RESIZE	0x40	// popup can be resized by dragging
 
 #ifdef FEAT_TEXT_PROP
 # define WIN_IS_POPUP(wp) ((wp)->w_popup_flags != 0)