vim: Import v8.1.0390

* 8.1.0390: scrollbars are not tested
* 8.1.0389: :behave command is not tested

Author: chrisbra

gitlog.txt

@@ -1 +1 @@
-* [8.1.0388](https://github.com/vim/vim/releases/tag/v8.1.0388): Coverity complains about possible NULL pointer use\n* [8.1.0387](https://github.com/vim/vim/releases/tag/v8.1.0387): no test for 'ambiwidth' detection\n* [8.1.0386](https://github.com/vim/vim/releases/tag/v8.1.0386): cannot test with non-default option value\n* [8.1.0385](https://github.com/vim/vim/releases/tag/v8.1.0385): Coveralls badge doesn't update\n* [8.1.0384](https://github.com/vim/vim/releases/tag/v8.1.0384): sign ordering depends on +netbeans feature\n* [8.1.0383](https://github.com/vim/vim/releases/tag/v8.1.0383): missing source file rename\n* [8.1.0382](https://github.com/vim/vim/releases/tag/v8.1.0382): some make programs can't handle "xdiff/../"\n* [8.1.0381](https://github.com/vim/vim/releases/tag/v8.1.0381): variable declaration not at start of block\n* [8.1.0380](https://github.com/vim/vim/releases/tag/v8.1.0380): "make proto" doesn't work well\n* [8.1.0379](https://github.com/vim/vim/releases/tag/v8.1.0379): build dependencies are incomplete\n* [8.1.0378](https://github.com/vim/vim/releases/tag/v8.1.0378): CI build failure\n* [8.1.0377](https://github.com/vim/vim/releases/tag/v8.1.0377): xdiff doesn't use the Vim memory allocation functions\n* [8.1.0376](https://github.com/vim/vim/releases/tag/v8.1.0376): compiler warning for uninitialized variable\n* [8.1.0375](https://github.com/vim/vim/releases/tag/v8.1.0375): cannot use diff mode with Cygwin diff.exe
+* [8.1.0390](https://github.com/vim/vim/releases/tag/v8.1.0390): scrollbars are not tested\n* [8.1.0389](https://github.com/vim/vim/releases/tag/v8.1.0389): :behave command is not tested