vim-patch:9.0.1785: wrong cursor position with 'showbreak' and lcs-eol (#24852)

Problem:  wrong cursor position with 'showbreak' and lcs-eol
Solution: Add size of 'showbreak' before when 'listchars' "eol" is used.
          Also fix wrong cursor position with wrapping virtual text on
          empty line and 'showbreak'.

closes: vim/vim#12891

1193951beb

test/functional/ui/decorations_spec.lua

@@ -2886,6 +2886,15 @@ bbbbbbb]])
       {1:~                             }|
                                     |
     ]]}
+    feed('zbx')
+    screen:expect{grid=[[
+        1 ^12312312312312312312312312|
+            {1:+}31231231231231231231231|
+            {1:+}23123123123123123123   |
+      {1:~                             }|
+      {1:~                             }|
+                                    |
+    ]]}
   end
 
   describe('with showbreak, smoothscroll', function()