vim: Import v8.1.1806

* 8.1.1806: test for display updating doesn't check without statusline
* 8.1.1805: au_did_filetype is declared twice
* 8.1.1804: no test for display updating without a scroll region
* 8.1.1803: all builtin functions are global
* 8.1.1802: missing change to call_callback()
* 8.1.1801: cannot build without the +eval feature
* 8.1.1800: function call functions have too many arguments
* 8.1.1799: cannot avoid mapping for a popup window
* 8.1.1798: warning for unused variable in tiny version
* 8.1.1797: the vgetorpeek() function is too long
* 8.1.1796: :argdo is not tested
* 8.1.1795: no syntax HL after splitting windows with :bufdo

Author: chrisbra

gitlog.txt

@@ -1 +1 @@
-* [8.1.1794](https://github.com/vim/vim/releases/tag/v8.1.1794): tests are flaky\n* [8.1.1793](https://github.com/vim/vim/releases/tag/v8.1.1793): mixed comment style in globals\n* [8.1.1792](https://github.com/vim/vim/releases/tag/v8.1.1792): the vgetorpeek() function is too long\n* [8.1.1791](https://github.com/vim/vim/releases/tag/v8.1.1791): 'completeslash' also applies to globpath()
+* [8.1.1806](https://github.com/vim/vim/releases/tag/v8.1.1806): test for display updating doesn't check without statusline\n* [8.1.1805](https://github.com/vim/vim/releases/tag/v8.1.1805): au_did_filetype is declared twice\n* [8.1.1804](https://github.com/vim/vim/releases/tag/v8.1.1804): no test for display updating without a scroll region\n* [8.1.1803](https://github.com/vim/vim/releases/tag/v8.1.1803): all builtin functions are global\n* [8.1.1802](https://github.com/vim/vim/releases/tag/v8.1.1802): missing change to call_callback()\n* [8.1.1801](https://github.com/vim/vim/releases/tag/v8.1.1801): cannot build without the +eval feature\n* [8.1.1800](https://github.com/vim/vim/releases/tag/v8.1.1800): function call functions have too many arguments\n* [8.1.1799](https://github.com/vim/vim/releases/tag/v8.1.1799): cannot avoid mapping for a popup window\n* [8.1.1798](https://github.com/vim/vim/releases/tag/v8.1.1798): warning for unused variable in tiny version\n* [8.1.1797](https://github.com/vim/vim/releases/tag/v8.1.1797): the vgetorpeek() function is too long\n* [8.1.1796](https://github.com/vim/vim/releases/tag/v8.1.1796): :argdo is not tested\n* [8.1.1795](https://github.com/vim/vim/releases/tag/v8.1.1795): no syntax HL after splitting windows with :bufdo