vim-patch:8.2.2366: when using ":sleep" the cursor is always displayed

Problem:    When using ":sleep" the cursor is always displayed.
Solution:   Do not display the cursor when using ":sleep!". (Jeremy Lerner,
            closes vim/vim#7688)
e2edc2ed4a

Cursor showing/hiding is moved from core to TUI.
":sleep!" behaves the same as ":sleep".

runtime/doc/index.txt

@@ -1543,6 +1543,8 @@ tag		command		action ~
 |:sign|		:sig[n]		manipulate signs
 |:silent|	:sil[ent]	run a command silently
 |:sleep|	:sl[eep]	do nothing for a few seconds
+|:sleep!|	:sl[eep]!	do nothing for a few seconds, without the
+				cursor visible
 |:slast|	:sla[st]	split window and go to last file in the
 				argument list
 |:smagic|	:sm[agic]	:substitute with 'magic'

runtime/doc/various.txt

@@ -494,7 +494,7 @@ gO			Show a filetype-specific, navigable "outline" of the
 			Default is one second. >
 			     :sleep	     "sleep for one second
 			     :5sleep	     "sleep for five seconds
-			     :sleep 100m     "sleep for a hundred milliseconds
+			     :sleep 100m     "sleep for 100 milliseconds
 			     10gs	     "sleep for ten seconds
 <			Can be interrupted with CTRL-C.
 			"gs" stands for "goto sleep".

src/nvim/ex_cmds.lua

@@ -2455,7 +2455,7 @@ module.cmds = {
   },
   {
     command='sleep',
-    flags=bit.bor(RANGE, COUNT, EXTRA, TRLBAR, CMDWIN),
+    flags=bit.bor(BANG, RANGE, COUNT, EXTRA, TRLBAR, CMDWIN),
     addr_type='ADDR_OTHER',
     func='ex_sleep',
   },

src/nvim/testdir/test_sleep.vim

@@ -0,0 +1,26 @@
+" Test for sleep and sleep! commands
+
+func! s:get_time_ms()
+  let timestr = reltimestr(reltime())
+  let dotidx = stridx(timestr, '.')
+  let sec = str2nr(timestr[:dotidx])
+  let msec = str2nr(timestr[dotidx + 1:])
+  return (sec * 1000) + (msec / 1000)
+endfunc
+
+func! s:assert_takes_longer(cmd, time_ms)
+  let start = s:get_time_ms()
+  execute a:cmd
+  let end = s:get_time_ms()
+  call assert_true(end - start >=# a:time_ms)
+endfun
+
+func! Test_sleep_bang()
+  call s:assert_takes_longer('sleep 50m', 50)
+  call s:assert_takes_longer('sleep! 50m', 50)
+  call s:assert_takes_longer('sl 50m', 50)
+  call s:assert_takes_longer('sl! 50m', 50)
+  call s:assert_takes_longer('1sleep', 1000)
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab