vim-patch:8.2.4956: reading past end of line with "gf" in Visual block mode

Problem:    Reading past end of line with "gf" in Visual block mode.
Solution:   Do not include the NUL in the length.
https://github.com/vim/vim/commit/395bd1f6d3edc9f7edb5d1f2d7deaf5a9e3ab93c

Omit trailing space: removed in patch 9.0.0126.

src/nvim/testdir/test_gf.vim

@@ -138,6 +138,22 @@ func Test_gf_visual()
   call assert_equal('Xtest_gf_visual', bufname('%'))
   call assert_equal(3, getcurpos()[1])
 
+  " do not include the NUL at the end
+  call writefile(['x'], 'X')
+  let save_enc = &enc
+  " for enc in ['latin1', 'utf-8']
+  for enc in ['utf-8']
+    exe "set enc=" .. enc
+    new
+    call setline(1, 'X')
+    set nomodified
+    exe "normal \<C-V>$gf"
+    call assert_equal('X', bufname())
+    bwipe!
+  endfor
+  let &enc = save_enc
+  call delete('X')
+
   " line number in visual area is used for file name
   if has('unix')
     bwipe!