- Tags are now created with `[tag]()`
- References are now created with `[tag]`
- Code spans are no longer wrapped

Problem:    illegal memory access when completing with invalid bytes.
Solution:   Avoid going over the end of the completion text.

vim/vim@4b28ba3

Co-authored-by: Bram Moolenaar <Bram@vim.org>

Problem Description: In ex_mode, the default_grid.chars are not allocated, and subsequently,
the w_grid.target in curwin is not allocated to default_grid in update_screen. This leads to
a null pointer crash when the completion function is executed in ex_mode.

Solution: Set full_screen when in ex_mode to ensure that default_grid is allocated.

It no longer hangs on Windows CI.

Instead cause some changes to screen state and use screen:expect().

Problem:  'shortmess' "F" flag doesn't work properly with 'autoread'
          (after 9.1.0154)
Solution: Hide the file info message instead of the warning dialog
          (zeertzjq)

closes: vim/vim#14159
closes: vim/vim#14158

https://github.com/vim/vim/commit/8a01744c563f615ae7f6b3ab7f5208214a45a8e2

Problem:  shm=F not respected when reloading buffer with 'autoread'
Solution: Check SHM_FILEINFO in buf_check_timestamp()
          (Shougo Matsushita)

closes: vim/vim#14144

https://github.com/vim/vim/commit/9db39b0ec90600bb41faec3a12b934b17c298b1f

Co-authored-by: Shougo Matsushita <Shougo.Matsu@gmail.com>

Problem:  Duplicate assignment in f_getregion().
Solution: Remove the duplicate assignment.  Also improve getregion()
          docs wording and fix an unrelated typo (zeertzjq)

closes: vim/vim#14154

https://github.com/vim/vim/commit/0df8f93bdaea77a1afb9f4eca94fe67ec73e6df2

Problem:  can only call getregion() for current buffer
Solution: Allow to retrieve selections from different buffers
          (Shougo Matsushita)

closes: vim/vim#14131

https://github.com/vim/vim/commit/84bf6e658da51126bdd2e50af1f40cabd149343f

Co-authored-by: Shougo Matsushita <Shougo.Matsu@gmail.com>