vim: Import v8.2.1512

* 8.2.1512: failure after trinary expression fails
* 8.2.1511: putting a string in Visual block mode ignores multi-byte
* 8.2.1510: using "var" in :def function may refer to legacy script var
* 8.2.1509: vertical separator is cleared when dragging a popup window
* 8.2.1508: not all debugger commands covered by tests
* 8.2.1507: using malloc() directly
* 8.2.1506: Vim9: no error when using a number other than 0 or 1 as bool

gitlog.txt

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-* [8.2.1505](https://github.com/vim/vim/commit/1b04ce2d400fda97410a961288c496bd8f445a9c): not all file read and writecode is tested\n* [8.2.1504](https://github.com/vim/vim/commit/7cb6fc29d067ed97c0b0c1d2d5767125ef9ae1ab): Vim9: white space checks are only done for a :def function\n* [8.2.1503](https://github.com/vim/vim/commit/81e17fbe00fd2ed93b262adc3ba41c86b02e7f46): Vim9: error for autocmd defined in :def in legacy script\n* [8.2.1502](https://github.com/vim/vim/commit/122616d9c1b57f1e1f29f1151f8e26d24df9092a): Vim9: can use += with a :let command at script level\n* [8.2.1501](https://github.com/vim/vim/commit/3fc71285d5ae7c16cf7be5d997fd1fe140f196da): Vim9: concatenating to constant reverses order
+* [8.2.1512](https://github.com/vim/vim/commit/69e44552c567ff25b363ba0790ad3d43fa0397a7): failure after trinary expression fails\n* [8.2.1511](https://github.com/vim/vim/commit/cd94277f72e29b740635da84bcd872c96e11bf67): putting a string in Visual block mode ignores multi-byte\n* [8.2.1510](https://github.com/vim/vim/commit/5390099a9733f7952a612670693dd4ebf9e0e178): using "var" in :def function may refer to legacy script var\n* [8.2.1509](https://github.com/vim/vim/commit/9943b3d97955ece99c747c959e0a7d493bb762bb): vertical separator is cleared when dragging a popup window\n* [8.2.1508](https://github.com/vim/vim/commit/c63b72b6dc1347530ce906b462bb568994552c8b): not all debugger commands covered by tests\n* [8.2.1507](https://github.com/vim/vim/commit/51b6eb47b3c41b01a5559b099e65354c8897093e): using malloc() directly\n* [8.2.1506](https://github.com/vim/vim/commit/d70840ed68296c1144d743e6335003c81c558c24): Vim9: no error when using a number other than 0 or 1 as bool