patch 8.2.4913: popup_hide() does not always have effect

Problem:    Popup_hide() does not always have effect.
Solution:   Add the POPF_HIDDEN_FORCE flag. (closes #10376)
diff --git a/src/popupwin.c b/src/popupwin.c
index 27e9fe1..2306dac 100644
--- a/src/popupwin.c
+++ b/src/popupwin.c
@@ -978,7 +978,7 @@
 
     nr = dict_get_bool(dict, (char_u *)"hidden", FALSE);
     if (nr > 0)
-	wp->w_popup_flags |= POPF_HIDDEN;
+	wp->w_popup_flags |= POPF_HIDDEN | POPF_HIDDEN_FORCE;
 
     // when "firstline" and "cursorline" are both set and the cursor would be
     // above or below the displayed lines, move the cursor to "firstline".
@@ -2644,7 +2644,10 @@
     id = (int)tv_get_number(argvars);
     wp = find_popup_win(id);
     if (wp != NULL)
+    {
 	popup_hide(wp);
+	wp->w_popup_flags |= POPF_HIDDEN_FORCE;
+    }
 }
 
     void
@@ -2674,6 +2677,7 @@
     wp = find_popup_win(id);
     if (wp != NULL)
     {
+	wp->w_popup_flags &= ~POPF_HIDDEN_FORCE;
 	popup_show(wp);
 #ifdef FEAT_QUICKFIX
 	if (wp->w_popup_flags & POPF_INFO)
@@ -3606,8 +3610,9 @@
 	textprop_T  prop;
 	linenr_T    lnum;
 
-	if (find_visible_prop(wp->w_popup_prop_win,
-		    wp->w_popup_prop_type, wp->w_popup_prop_id,
+	if ((wp->w_popup_flags & POPF_HIDDEN_FORCE) == 0
+		&& find_visible_prop(wp->w_popup_prop_win,
+				    wp->w_popup_prop_type, wp->w_popup_prop_id,
 							   &prop, &lnum) == OK)
 	{
 	    wp->w_popup_flags &= ~POPF_HIDDEN;
diff --git a/src/testdir/dumps/Test_popup_prop_not_visible_01a.dump b/src/testdir/dumps/Test_popup_prop_not_visible_01a.dump
new file mode 100644
index 0000000..0b97cb8
--- /dev/null
+++ b/src/testdir/dumps/Test_popup_prop_not_visible_01a.dump
@@ -0,0 +1,10 @@
+| +2&#ffffff0|2+2#e000e06&|++2#0000000&| |[|N|o| |N|a|m|e|]| | +1&&@60
+| +0&&@42||+1&&> +0&&@30
+|~+0#4040ff13&| @41||+1#0000000&|s+0&&|o|m|e| |t|e|x|t| @21
+|~+0#4040ff13&| @41||+1#0000000&| +0&&@30
+|~+0#4040ff13&| @41||+1#0000000&|o+0&&|t|h|e|r| |t|e|x|t|a+0#ffffff16#e000002|t@1|a|c|h|e|d| |t|o| |"|o|t|h|e|r|"| +0#0000000#ffffff0@1
+|~+0#4040ff13&| @41||+1#0000000&|~+0#4040ff13&| @29
+|~| @41||+1#0000000&|~+0#4040ff13&| @29
+|~| @41||+1#0000000&|~+0#4040ff13&| @29
+|[+1#0000000&|N|o| |N|a|m|e|]| @15|0|,|0|-|1| @9|A|l@1| |[+3&&|N|o| |N|a|m|e|]| |[|+|]| @2|1|,|0|-|1| @6|A|l@1
+|:+0&&|c|a|l@1| |p|o|p|u|p|_|h|i|d|e|(|g|:|s|o|m|e|_|i|d|)| @47
diff --git a/src/testdir/dumps/Test_popup_prop_not_visible_01b.dump b/src/testdir/dumps/Test_popup_prop_not_visible_01b.dump
new file mode 100644
index 0000000..e8a5c2e
--- /dev/null
+++ b/src/testdir/dumps/Test_popup_prop_not_visible_01b.dump
@@ -0,0 +1,10 @@
+| +2&#ffffff0|2+2#e000e06&|++2#0000000&| |[|N|o| |N|a|m|e|]| | +1&&@60
+| +0&&@42||+1&&> +0&&@30
+|~+0#4040ff13&| @41||+1#0000000&|s+0&&|o|m|e| |t|e|x|t|a+0#ffffff16#e000002|t@1|a|c|h|e|d| |t|o| |"|s|o|m|e|"| +0#0000000#ffffff0@3
+|~+0#4040ff13&| @41||+1#0000000&| +0&&@30
+|~+0#4040ff13&| @41||+1#0000000&|o+0&&|t|h|e|r| |t|e|x|t|a+0#ffffff16#e000002|t@1|a|c|h|e|d| |t|o| |"|o|t|h|e|r|"| +0#0000000#ffffff0@1
+|~+0#4040ff13&| @41||+1#0000000&|~+0#4040ff13&| @29
+|~| @41||+1#0000000&|~+0#4040ff13&| @29
+|~| @41||+1#0000000&|~+0#4040ff13&| @29
+|[+1#0000000&|N|o| |N|a|m|e|]| @15|0|,|0|-|1| @9|A|l@1| |[+3&&|N|o| |N|a|m|e|]| |[|+|]| @2|1|,|0|-|1| @6|A|l@1
+|:+0&&|c|a|l@1| |p|o|p|u|p|_|s|h|o|w|(|g|:|s|o|m|e|_|i|d|)| @47
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 3e5373c..f58b159 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -4055,7 +4055,7 @@
       setline(1, ['', 'some text', '', 'other text'])
       prop_type_add('someprop', {})
       prop_add(2, 9, {type: 'someprop', length: 5})
-      popup_create('attached to "some"', {
+      g:some_id = popup_create('attached to "some"', {
           textprop: 'someprop',
           highlight: 'ErrorMsg',
           line: -1,
@@ -4076,6 +4076,12 @@
   let buf = RunVimInTerminal('-S XtestPropNotVisble', #{rows: 10})
   call VerifyScreenDump(buf, 'Test_popup_prop_not_visible_01', {})
 
+  " check that hiding and unhiding the popup works
+  call term_sendkeys(buf, ":call popup_hide(g:some_id)\<CR>")
+  call VerifyScreenDump(buf, 'Test_popup_prop_not_visible_01a', {})
+  call term_sendkeys(buf, ":call popup_show(g:some_id)\<CR>")
+  call VerifyScreenDump(buf, 'Test_popup_prop_not_visible_01b', {})
+
   call term_sendkeys(buf, ":vert resize -14\<CR>")
   call VerifyScreenDump(buf, 'Test_popup_prop_not_visible_02', {})
 
diff --git a/src/version.c b/src/version.c
index ead455b..792bd24 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4913,
+/**/
     4912,
 /**/
     4911,
diff --git a/src/vim.h b/src/vim.h
index 9e34c2e..f17da41 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -631,15 +631,16 @@
 // Values for w_popup_flags.
 #define POPF_IS_POPUP	0x01	// this is a popup window
 #define POPF_HIDDEN	0x02	// popup is not displayed
-#define POPF_CURSORLINE	0x04	// popup is highlighting at the cursorline
-#define POPF_ON_CMDLINE	0x08	// popup overlaps command line
-#define POPF_DRAG	0x10	// popup can be moved by dragging border
-#define POPF_DRAGALL	0x20	// popup can be moved by dragging everywhere
-#define POPF_RESIZE	0x40	// popup can be resized by dragging
-#define POPF_MAPPING	0x80	// mapping keys
-#define POPF_INFO	0x100	// used for info of popup menu
-#define POPF_INFO_MENU	0x200	// align info popup with popup menu
-#define POPF_POSINVERT	0x400	// vertical position can be inverted
+#define POPF_HIDDEN_FORCE 0x04	// popup is explicitly set to not be displayed
+#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 border
+#define POPF_DRAGALL	0x40	// popup can be moved by dragging everywhere
+#define POPF_RESIZE	0x80	// popup can be resized by dragging
+#define POPF_MAPPING	0x100	// mapping keys
+#define POPF_INFO	0x200	// used for info of popup menu
+#define POPF_INFO_MENU	0x400	// align info popup with popup menu
+#define POPF_POSINVERT	0x800	// vertical position can be inverted
 
 // flags used in w_popup_handled
 #define POPUP_HANDLED_1	    0x01    // used by mouse_find_win()