vim: Import v8.1.1640

* 8.1.1640: the CursorHold autocommand takes down a balloon
* 8.1.1639: changing an autoload name into a file name is inefficient
* 8.1.1638: running tests leaves some files behind
* 8.1.1637: after running tests and clean the XfakeHOME directory remains
* 8.1.1636: crash when popup has fitting scrollbar

Author: chrisbra

gitlog.txt

@@ -1 +1 @@
-* [8.1.1635](https://github.com/vim/vim/releases/tag/v8.1.1635): warnings for unused variables in small version\n* [8.1.1634](https://github.com/vim/vim/releases/tag/v8.1.1634): terminal test fails when term_getansicolors() is missing\n* [8.1.1633](https://github.com/vim/vim/releases/tag/v8.1.1633): cannot generate prototypes with X11 but without GUI\n* [8.1.1632](https://github.com/vim/vim/releases/tag/v8.1.1632): build with EXITFREE but without +arabic fails\n* [8.1.1631](https://github.com/vim/vim/releases/tag/v8.1.1631): displaying signs is inefficient\n* [8.1.1630](https://github.com/vim/vim/releases/tag/v8.1.1630): various small problems\n* Update runtime files\n* [8.1.1629](https://github.com/vim/vim/releases/tag/v8.1.1629): terminal function help is in the wrong file\n* [8.1.1628](https://github.com/vim/vim/releases/tag/v8.1.1628): popup window functions not in list of functions\n* [8.1.1627](https://github.com/vim/vim/releases/tag/v8.1.1627): header file contains mixed comment style\n* [8.1.1626](https://github.com/vim/vim/releases/tag/v8.1.1626): no test for closing a popup window with a modified buffer\n* [8.1.1625](https://github.com/vim/vim/releases/tag/v8.1.1625): script line numbers are not exactly right\n* [8.1.1624](https://github.com/vim/vim/releases/tag/v8.1.1624): when testing in the GUI may try to run gvim in a terminal\n* [8.1.1623](https://github.com/vim/vim/releases/tag/v8.1.1623): display wrong with signs in narrow number column
+* [8.1.1640](https://github.com/vim/vim/releases/tag/v8.1.1640): the CursorHold autocommand takes down a balloon\n* [8.1.1639](https://github.com/vim/vim/releases/tag/v8.1.1639): changing an autoload name into a file name is inefficient\n* [8.1.1638](https://github.com/vim/vim/releases/tag/v8.1.1638): running tests leaves some files behind\n* [8.1.1637](https://github.com/vim/vim/releases/tag/v8.1.1637): after running tests and clean the XfakeHOME directory remains\n* [8.1.1636](https://github.com/vim/vim/releases/tag/v8.1.1636): crash when popup has fitting scrollbar