after/syntax/syncolor.vim file should transition that file into a
  colorscheme. |:colorscheme|

Vimscript compatibility:
- `count` does not alias to |v:count|
- `errmsg` does not alias to |v:errmsg|
- `shell_error` does not alias to |v:shell_error|
- `this_session` does not alias to |v:this_session|

Working directory (Vim implemented some of these after Nvim):
- |DirChanged| and |DirChangedPre| can be triggered when switching to another
  window or tab.
- |getcwd()| and |haslocaldir()| may throw errors if the tab page or window
  cannot be found.  *E5000* *E5001* *E5002*
- |haslocaldir()| checks for tab-local directory if and only if -1 is passed as
  window number, and its only possible returns values are 0 and 1.
- `getcwd(-1)` is equivalent to `getcwd(-1, 0)` instead of returning the global
  working directory. Use `getcwd(-1, -1)` to get the global working directory.

Options:
- 'titlestring' uses printf-style '%' items (see: 'statusline') to implement
  the default behaviour. The implementation is equivalent to setting
  'titlestring' to `%t%(\ %M%)%(\ \(%{expand(\"%:~:h\")}\)%)%a\ -\ Nvim`.

==============================================================================
Missing features                                         *nvim-missing*

These legacy Vim features are not yet implemented:

- *:gui*
- *:gvim*
- *'browsedir'* *'bsdir'*
- *'completepopup'*
- *'guioptions'* *'go'*
- *'guitablabel'* *'gtl'*
- *'guitabtooltip'* *'gtt'*
- *'mouseshape'* *'mouses'*
- *'previewpopup'*

==============================================================================
Removed legacy features                                  *nvim-removed*

These Vim features were intentionally removed from Nvim.

Aliases:
- ex        (alias for "nvim -e")
- exim      (alias for "nvim -E")
- gex       (GUI)
- gview     (GUI)
- gvim      (GUI)
- gvimdiff  (GUI)
- rgview    (GUI)
- rgvim     (GUI)
- rview
- rvim
- view      (alias for "nvim -R")
- vimdiff   (alias for "nvim -d" |diff-mode|)

Commands:
- :behave
- :fixdel
- *hardcopy* `:hardcopy` was removed. Instead, use `:TOhtml` and print the
  resulting HTML using a web browser or other HTML viewer.
- :helpfind
- :mode (no longer accepts an argument)
- :open
- :Print
- :promptfind
- :promptrepl
- :scriptversion (always version 1)
- :shell
- :smile
- :tearoff
- :cstag
- :cscope
- :lcscope
- :scscope
- :Vimuntar
- `:TOhtml` was replaced by a Lua version (with various differences)

Compile-time features:
- Emacs tags support
- X11 integration (see |x11-selection|)

Cscope:
                                                                      *cscope*
- Cscope support was removed in favour of plugin-based solutions such as:
  https://github.com/dhananjaylatkar/cscope_maps.nvim

Eval:
- *Vim9script* (the Vim 9+ flavor of Vimscript) is not supported.
- *cscope_connection()*
- *err_teapot()*
- *js_encode()*
- *js_decode()*
- *v:none* (used by Vim to represent JavaScript "undefined"); use |v:null| instead.
- *v:sizeofint*
- *v:sizeoflong*
- *v:sizeofpointer*

Events:
- *SafeStateAgain*
- *SigUSR1* Use |Signal| to detect `SIGUSR1` signal instead.

Options:
- *'aleph'* *'al'*
- antialias
- 'backspace' no longer supports number values. Instead:
    - for `backspace=0` set `backspace=` (empty)
    - for `backspace=1` set `backspace=indent,eol`
    - for `backspace=2` set `backspace=indent,eol,start` (default behavior in Nvim)
    - for `backspace=3` set `backspace=indent,eol,nostop`
- *'balloondelay'* *'bdlay'*
- *'ballooneval'* *'beval'* *'noballooneval'* *'nobeval'*
- *'balloonexpr'* *'bexpr'*
- bioskey (MS-DOS)
- conskey (MS-DOS)
- *'cp'* *'nocompatible'* *'nocp'* *'compatible'* (Nvim is always "nocompatible".)
- 'cpoptions' (gjpkHw<*- and all POSIX flags were removed)
- *'cryptmethod'* *'cm'* *'key'* (Vim encryption implementation)
- cscopepathcomp
- cscopeprg
- cscopequickfix
- cscoperelative
- cscopetag
- cscopetagorder
- cscopeverbose
- *'ed'* *'edcompatible'* *'noed'* *'noedcompatible'*
- 'encoding' ("utf-8"