vim-patch:9.1.1836: 'culopt' "screenline" not redrawn with line("w0") and :retab

Problem:  'cursorlineopt' "screenline" isn't redrawn when moving cursor
          and then using line("w0") and :retab that does nothing.
Solution: Call redraw_for_cursorcolumn() when setting a valid w_virtcol
          (zeertzjq).

closes: vim/vim#18506

a084914361

test/old/testdir/test_conceal.vim

@@ -394,6 +394,10 @@ func Test_conceal_mouse_click()
   syn match Concealed "this" conceal
   hi link Concealed Search
 
+  " Nvim: need to redraw before processing every key, because mouse clicks set
+  " w_redr_type, which prevent using vcols[].
+  lua _G.NS = vim.on_key(function() vim.cmd.redraw() end)
+
   " Test with both 'nocursorline' and 'cursorline', as they use two different
   " code paths to set virtual columns for the cells to clear.
   for cul in [v:false, v:true]
@@ -550,6 +554,8 @@ func Test_conceal_mouse_click()
     setlocal number& signcolumn&
   endfor
 
+  lua vim.on_key(nil, _G.NS); _G.NS = nil
+
   call CloseWindow()
   set mouse&
 endfunc

test/old/testdir/test_cursorline.vim

@@ -296,9 +296,17 @@ func Test_cursorline_screenline_update()
   CheckScreendump
 
   let lines =<< trim END
+      func TestRetab()
+        let w = winwidth(0)
+        call cursor([1, w + 1, 0, w + 1])
+        call line('w0')
+        retab 8
+      endfunc
+
       call setline(1, repeat('xyz ', 30))
-      set cursorline cursorlineopt=screenline
+      set cursorline cursorlineopt=screenline tabstop=8
       inoremap <F2> <Cmd>call cursor(1, 1)<CR>
+      inoremap <F3> <Cmd>call TestRetab()<CR>
   END
   call writefile(lines, 'Xcul_screenline', 'D')
 
@@ -307,6 +315,8 @@ func Test_cursorline_screenline_update()
   call VerifyScreenDump(buf, 'Test_cursorline_screenline_1', {})
   call term_sendkeys(buf, "\<F2>")
   call VerifyScreenDump(buf, 'Test_cursorline_screenline_2', {})
+  call term_sendkeys(buf, "\<F3>")
+  call VerifyScreenDump(buf, 'Test_cursorline_screenline_3', {})
   call term_sendkeys(buf, "\<Esc>")
 
   call StopVimInTerminal(buf)