patch 8.1.1902: cannot have an info popup without a border

Problem:    Cannot have an info popup without a border.
Solution:   Add the "border" item to 'completepopup'.
diff --git a/src/testdir/dumps/Test_popupwin_infopopup_nb_1.dump b/src/testdir/dumps/Test_popupwin_infopopup_nb_1.dump
new file mode 100644
index 0000000..41208ee
--- /dev/null
+++ b/src/testdir/dumps/Test_popupwin_infopopup_nb_1.dump
@@ -0,0 +1,14 @@
+|t+0&#ffffff0|e|x|t| |t|e|x|t| |t|e|x|t| |t|e|x|t| |t|e|x|t| |t|a|w|o|r|d> @43
+|~+0#4040ff13&| @23| +0#0000001#e0e0e08|w|r|d| @4|W| |e|x|t|r|a| |t|e|x|t| @1|w|o|r|d|s| |a|r|e| |c|o@1|l| | +0#4040ff13#ffffff0@11
+|~| @23| +0#0000001#ffd7ff255|a|n|o|t|w|r|d| |W| |e|x|t|r|a| |t|e|x|t| | +0#4040ff13#ffffff0@27
+|~| @23| +0#0000001#ffd7ff255|n|o|a|w|r|d| @1|W| |e|x|t|r|a| |t|e|x|t| | +0#4040ff13#ffffff0@27
+|~| @23| +0#0000001#ffd7ff255|t|h|a|t|w|r|d| |W| |e|x|t|r|a| |t|e|x|t| | +0#4040ff13#ffffff0@27
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|-+2#0000000&@1| |U|s|e|r| |d|e|f|i|n|e|d| |c|o|m|p|l|e|t|i|o|n| |(|^|U|^|N|^|P|)| |m+0#00e0003&|a|t|c|h| |1| |o|f| |4| +0#0000000&@26
diff --git a/src/testdir/gen_opt_test.vim b/src/testdir/gen_opt_test.vim
index 3c182ea..a8eca74 100644
--- a/src/testdir/gen_opt_test.vim
+++ b/src/testdir/gen_opt_test.vim
@@ -78,7 +78,7 @@
       \ 'complete': [['', 'w,b'], ['xxx']],
       \ 'concealcursor': [['', 'n', 'nvic'], ['xxx']],
       \ 'completeopt': [['', 'menu', 'menu,longest'], ['xxx', 'menu,,,longest,']],
-      \ 'completepopup': [['', 'height:13', 'highlight:That', 'width:10,height:234,highlight:Mine'], ['height:yes', 'width:no', 'xxx', 'xxx:99']],
+      \ 'completepopup': [['', 'height:13', 'highlight:That', 'width:10,height:234,highlight:Mine'], ['height:yes', 'width:no', 'xxx', 'xxx:99', 'border:maybe', 'border:1']],
       \ 'completeslash': [['', 'slash', 'backslash'], ['xxx']],
       \ 'cryptmethod': [['', 'zip'], ['xxx']],
       \ 'cscopequickfix': [['', 's-', 's-,c+,e0'], ['xxx', 's,g,d']],
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 15a61f9..98522b7 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -2193,14 +2193,11 @@
   call delete('Xheader.h')
 endfunc
 
-func Test_popupmenu_info()
-  CheckScreendump
-
+func Get_popupmenu_lines()
   let lines =<< trim END
       set completeopt+=preview,popup
       set completefunc=CompleteFuncDict
       hi InfoPopup ctermbg=yellow
-      set completepopup=height:4,highlight:InfoPopup
 
       func CompleteFuncDict(findstart, base)
 	if a:findstart
@@ -2249,7 +2246,16 @@
       endfunc
       call setline(1, 'text text text text text text text ')
   END
+  return lines
+endfunc
+
+func Test_popupmenu_info_border()
+  CheckScreendump
+
+  let lines = Get_popupmenu_lines()
+  call add(lines, 'set completepopup=height:4,highlight:InfoPopup')
   call writefile(lines, 'XtestInfoPopup')
+
   let buf = RunVimInTerminal('-S XtestInfoPopup', #{rows: 14})
   call term_wait(buf, 50)
 
@@ -2269,4 +2275,21 @@
   call delete('XtestInfoPopup')
 endfunc
 
+func Test_popupmenu_info_noborder()
+  CheckScreendump
+
+  let lines = Get_popupmenu_lines()
+  call add(lines, 'set completepopup=height:4,border:off')
+  call writefile(lines, 'XtestInfoPopupNb')
+
+  let buf = RunVimInTerminal('-S XtestInfoPopupNb', #{rows: 14})
+  call term_wait(buf, 50)
+
+  call term_sendkeys(buf, "A\<C-X>\<C-U>")
+  call VerifyScreenDump(buf, 'Test_popupwin_infopopup_nb_1', {})
+
+  call StopVimInTerminal(buf)
+  call delete('XtestInfoPopupNb')
+endfunc
+
 " vim: shiftwidth=2 sts=2