patch 8.1.1917: non-current window is not redrawn when moving popup

Problem:    Non-current window is not redrawn when moving popup. (Ben Jackson)
Solution:   Redraw all windows under a popup. (closes #4860)
diff --git a/src/testdir/dumps/Test_popupwin_drag_01.dump b/src/testdir/dumps/Test_popupwin_drag_01.dump
index 64afe82..afed63e 100644
--- a/src/testdir/dumps/Test_popupwin_drag_01.dump
+++ b/src/testdir/dumps/Test_popupwin_drag_01.dump
@@ -1,10 +1,10 @@
->1+0&#ffffff0| @73
-|2| @73
-|3| @73
-|4| @73
-|5| @73
-|6| @31|╔+0#0000001#ffd7ff255|═@5|╗| +0#0000000#ffffff0@33
-|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| 
+>1+0&#ffffff0| @35||+1&&|1+0&&| @35
+|2| @35||+1&&|2+0&&| @35
+|3| @35||+1&&|3+0&&| @35
+|4| @35||+1&&|4+0&&| @35
+|[+3&&|N|o| |N|a|m|e|]| |[|+|]| @5|1|,|1| @11|T|o|p| |[+1&&|N|o| |N|a|m|e|]| |[|+|]| @5|1|,|1| @11|T|o|p
+|1+0&&| @31|╔+0#0000001#ffd7ff255|═@5|╗| +0#0000000#ffffff0@33
+|2| @31|║+0#0000001#ffd7ff255|1@3| @1|║| +0#0000000#ffffff0@33
+|3| @31|║+0#0000001#ffd7ff255|2@5|║| +0#0000000#ffffff0@33
+|[+1&&|N|o| |N|a|m|e|]| |[|+|]| @5|1|,|1| @10|║+0#0000001#ffd7ff255|3@4| |║| +1#0000000#ffffff0|N|a|m|e|]| |[|+|]| @5|1|,|1| @11|T|o|p
+| +0&&@32|╚+0#0000001#ffd7ff255|═@5|⇲| +0#0000000#ffffff0@33
diff --git a/src/testdir/dumps/Test_popupwin_drag_02.dump b/src/testdir/dumps/Test_popupwin_drag_02.dump
index 2597e1d..a6a560d 100644
--- a/src/testdir/dumps/Test_popupwin_drag_02.dump
+++ b/src/testdir/dumps/Test_popupwin_drag_02.dump
@@ -1,10 +1,10 @@
->1+0&#ffffff0| @73
-|2| @31|╔+0#0000001#ffd7ff255|═@5|╗| +0#0000000#ffffff0@33
-|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
-|7| @73
-|8| @73
-|9| @73
-@57|1|,|1| @10|T|o|p| 
+>1+0&#ffffff0| @35||+1&&|1+0&&| @35
+|2| @11|╔+0#0000001#ffd7ff255|═@5|╗| +0#0000000#ffffff0@15||+1&&|2+0&&| @35
+|3| @11|║+0#0000001#ffd7ff255|1@3| @1|║| +0#0000000#ffffff0@15||+1&&|3+0&&| @35
+|4| @11|║+0#0000001#ffd7ff255|2@5|║| +0#0000000#ffffff0@15||+1&&|4+0&&| @35
+|[+3&&|N|o| |N|a|m|e|]| |[|+|]|║+0#0000001#ffd7ff255|3@4| |║|1+3#0000000#ffffff0| @11|T|o|p| |[+1&&|N|o| |N|a|m|e|]| |[|+|]| @5|1|,|1| @11|T|o|p
+|1+0&&| @11|╚+0#0000001#ffd7ff255|═@5|⇲| +0#0000000#ffffff0@15||+1&&|1+0&&| @35
+|2| @35||+1&&|2+0&&| @35
+|3| @35||+1&&|3+0&&| @35
+|[+1&&|N|o| |N|a|m|e|]| |[|+|]| @5|1|,|1| @11|T|o|p| |[|N|o| |N|a|m|e|]| |[|+|]| @5|1|,|1| @11|T|o|p
+| +0&&@74
diff --git a/src/testdir/dumps/Test_popupwin_drag_03.dump b/src/testdir/dumps/Test_popupwin_drag_03.dump
index b6b363a..497a6e3 100644
--- a/src/testdir/dumps/Test_popupwin_drag_03.dump
+++ b/src/testdir/dumps/Test_popupwin_drag_03.dump
@@ -1,10 +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| 
+>1+0&#ffffff0| @35||+1&&|1+0&&| @35
+|2| @11|╔+0#0000001#ffd7ff255|═@9|╗| +0#0000000#ffffff0@11||+1&&|2+0&&| @35
+|3| @11|║+0#0000001#ffd7ff255|1@3| @5|║| +0#0000000#ffffff0@11||+1&&|3+0&&| @35
+|4| @11|║+0#0000001#ffd7ff255|2@5| @3|║| +0#0000000#ffffff0@11||+1&&|4+0&&| @35
+|[+3&&|N|o| |N|a|m|e|]| |[|+|]|║+0#0000001#ffd7ff255|3@4| @4|║| +3#0000000#ffffff0@8|T|o|p| |[+1&&|N|o| |N|a|m|e|]| |[|+|]| @5|1|,|1| @11|T|o|p
+|1+0&&| @11|║+0#0000001#ffd7ff255| +0#4040ff13&@9|║+0#0000001&| +0#0000000#ffffff0@11||+1&&|1+0&&| @35
+|2| @11|╚+0#0000001#ffd7ff255|═@9|⇲| +0#0000000#ffffff0@11||+1&&|2+0&&| @35
+|3| @35||+1&&|3+0&&| @35
+|[+1&&|N|o| |N|a|m|e|]| |[|+|]| @5|1|,|1| @11|T|o|p| |[|N|o| |N|a|m|e|]| |[|+|]| @5|1|,|1| @11|T|o|p
+|:+0&&|c|a|l@1| |R|e|s|i|z|e|(|)| @60
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 23041d1..810a204 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -343,6 +343,11 @@
   " create a popup that covers the command line
   let lines =<< trim END
 	call setline(1, range(1, 20))
+	split
+	vsplit
+	$wincmd w
+	vsplit
+	1wincmd w
 	let winid = popup_create(['1111', '222222', '33333'], #{
 	      \ drag: 1,
 	      \ resize: 1,
@@ -353,12 +358,12 @@
 	  call feedkeys("\<F3>\<LeftMouse>\<F4>\<LeftDrag>\<LeftRelease>", "xt")
 	endfunc
 	map <silent> <F3> :call test_setmouse(&lines - 4, &columns / 2)<CR>
-	map <silent> <F4> :call test_setmouse(&lines - 8, &columns / 2)<CR>
+	map <silent> <F4> :call test_setmouse(&lines - 8, &columns / 2 - 20)<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>
+	map <silent> <F5> :call test_setmouse(6, 21)<CR>
+	map <silent> <F6> :call test_setmouse(7, 25)<CR>
   END
   call writefile(lines, 'XtestPopupDrag')
   let buf = RunVimInTerminal('-S XtestPopupDrag', #{rows: 10})