vim: Import v8.2.3848

* 8.2.3848: cannot use reduce() for a string
* 8.2.3847: illegal memory access when using a lambda with an error
* 8.2.3846: no error when using control character for 'lcs' or 'fcs'
* 8.2.3845: Vim9: test fails when the channel feature is missing
* 8.2.3844: Vim9: no type error if assigning func(number) to func(string)

gitlog.txt

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-* [8.2.3843](https://github.com/vim/vim/commit/647ab4cede4dbf412d24748f8e0a64d1cb9239f4): dep3patch files are not recognized\n* [8.2.3842](https://github.com/vim/vim/commit/422085f1c87cb6bea879158b8b05c4a5cf7ab48b): Vim9: can change locked list and list items\n* [8.2.3841](https://github.com/vim/vim/commit/71b768509250b12696e8cc90e5902029f1b5433d): Vim9: outdated TODO items, disabled tests that work\n* [8.2.3840](https://github.com/vim/vim/commit/ddc80aff575dd60c04c79621a0358cf0abaac53a): useless test for negative index in check functions\n* [8.2.3839](https://github.com/vim/vim/commit/354b23a9f87fd8c5aec457d88320a0a5bce4b985): using \z() with \z1 not tested for syntax highlighting\n* [8.2.3838](https://github.com/vim/vim/commit/db1a410b610b2c1941311acc57dcc4afec20720e): cannot use script-local function for setting \*func options\n* [8.2.3837](https://github.com/vim/vim/commit/d2ff705af32862b4da49d213613233f93343874c): QNX: crash when compiled with GUI but using terminal\n* [8.2.3836](https://github.com/vim/vim/commit/02929a372e5e14db1b85abdc7d4515d6b2d81888): Vim9: comment after expression not skipped to find NL\n* [8.2.3835](https://github.com/vim/vim/commit/259f443a934c6f2447a14bfe54403903416a9af0): the inline-function example does not work\n* [8.2.3834](https://github.com/vim/vim/commit/deda6441e457072df39cdc8744dcd685d77fa273): Test\_out\_cb often fails on Mac\n* [8.2.3833](https://github.com/vim/vim/commit/c3f91c0648f4b04a6a9ceb4ccec45ea767a63796): error from term\_start() not caught by try/catch
+* [8.2.3848](https://github.com/vim/vim/commit/0ccb5842f5fb103763d106c7aa364d758343c35a): cannot use reduce() for a string\n* [8.2.3847](https://github.com/vim/vim/commit/605ec91e5a7330d61be313637e495fa02a6dc264): illegal memory access when using a lambda with an error\n* [8.2.3846](https://github.com/vim/vim/commit/60618c8f1a7ea55452837a446525272142286471): no error when using control character for 'lcs' or 'fcs'\n* [8.2.3845](https://github.com/vim/vim/commit/0dc4d8eaecc3acc26c3bee906d98097f9faa90bd): Vim9: test fails when the channel feature is missing\n* [8.2.3844](https://github.com/vim/vim/commit/44a8977de467241a2f9959253d06eff53a8baad9): Vim9: no type error if assigning func(number) to func(string)