patch 9.2.0423: popup: wrapped cmdline truncated with wildoptions=pum

Problem:  popup: wrapped cmdline truncated with wildoptions=pum
Solution: Call msg_starthere() in redrawcmd() to reset lines_left
          before each redraw (Yasuhiro Matsumoto).

redrawcmd() leaves lines_left at its previous value, which decrements
across successive redraws (e.g. when wildtrigger() refreshes the popup
on every keystroke) until 0, after which msg_no_more aborts drawing
the wrapped cmdline. Call msg_starthere() to reset it.

related: #20081

Signed-off-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/ex_getln.c

@@ -4122,6 +4122,8 @@ redrawcmd(void)
 
     sb_text_restart_cmdline();
     msg_start();
+    // Reset lines_left so a wrapped cmdline isn't truncated by msg_no_more.
+    msg_starthere();
     redrawcmdprompt();
 
     // Don't use more prompt, truncate the cmdline if it doesn't fit.

src/testdir/dumps/Test_wildtrigger_wrapped_cmdline_1.dump

@@ -0,0 +1,8 @@
+|~+0#4040ff13#ffffff0| @28
+|~| @28
+|~| @28
+|~| @28
+|~| @28
+|~| @28
+|:+0#0000000&|e| |x@26
+@13> @16

src/testdir/test_cmdline.vim

@@ -5249,6 +5249,32 @@ func Test_wildtrigger_update_screen()
   call StopVimInTerminal(buf)
 endfunc
 
+" Wrapped cmdline must not be truncated when wildtrigger() redraws on every
+" keystroke.
+func Test_wildtrigger_wrapped_cmdline()
+  CheckScreendump
+
+  let lines =<< trim [SCRIPT]
+    set wildmenu wildmode=noselect:lastused,full wildoptions=pum
+    cnoremap <F8> <C-R>=wildtrigger()[-1]<CR>
+  [SCRIPT]
+  call writefile(lines, 'XTest_wildtrigger_wrap', 'D')
+  let rows = 8
+  let cols = 30
+  let buf = RunVimInTerminal('-S XTest_wildtrigger_wrap', {'rows': rows, 'cols': cols})
+
+  call term_sendkeys(buf, ":e ")
+  for i in range(40)
+    call term_sendkeys(buf, "x\<F8>")
+  endfor
+
+  call WaitForTermCurPosAndLinesToMatch(buf, [rows, ((3 + 40) - cols + 1)])
+  call VerifyScreenDump(buf, 'Test_wildtrigger_wrapped_cmdline_1', {})
+
+  call term_sendkeys(buf, "\<Esc>")
+  call StopVimInTerminal(buf)
+endfunc
+
 " Issue #17969: With 'noselect', the popup menu should appear next to the
 " environment variable being expanded. Disable 'showtail' when completing
 " file paths when 'noselect' is present.

src/version.c

@@ -729,6 +729,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    423,
 /**/
     422,
 /**/