patch 9.0.1800: Cursor position still wrong with 'showbreak' and virtual text

Problem:  Cursor position still wrong with 'showbreak' and virtual text
          after last character or 'listchars' "eol".
Solution: Remove unnecessary w_wcol adjustment in curs_columns(). Also
          fix first char of virtual text not shown at the start of a screen
          line.

closes: #12478
closes: #12532
closes: #12904

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
diff --git a/src/testdir/test_breakindent.vim b/src/testdir/test_breakindent.vim
index 2bc85a3..3c4d0f1 100644
--- a/src/testdir/test_breakindent.vim
+++ b/src/testdir/test_breakindent.vim
@@ -898,7 +898,6 @@
       vim9script
       &signcolumn = 'yes'
       &showbreak = '++'
-      &breakindent = true
       &breakindentopt = 'shift:2'
       var leftcol: number = win_getid()->getwininfo()->get(0, {})->get('textoff')
       repeat('x', &columns - leftcol - 1)->setline(1)
@@ -912,9 +911,14 @@
   " No line wraps, so changing 'showbreak' should lead to the same screen.
   call term_sendkeys(buf, "\<C-\>\<C-O>:setlocal showbreak=+\<CR>")
   call VerifyScreenDump(buf, 'Test_cursor_position_with_showbreak_1', {})
+  " No line wraps, so setting 'breakindent' should lead to the same screen.
+  call term_sendkeys(buf, "\<C-\>\<C-O>:setlocal breakindent\<CR>")
+  call VerifyScreenDump(buf, 'Test_cursor_position_with_showbreak_1', {})
   " The first line now wraps because of "eol" in 'listchars'.
   call term_sendkeys(buf, "\<C-\>\<C-O>:setlocal list\<CR>")
   call VerifyScreenDump(buf, 'Test_cursor_position_with_showbreak_2', {})
+  call term_sendkeys(buf, "\<C-\>\<C-O>:setlocal nobreakindent\<CR>")
+  call VerifyScreenDump(buf, 'Test_cursor_position_with_showbreak_3', {})
 
   call StopVimInTerminal(buf)
 endfunc