vim: Import v8.2.4554

* 8.2.4554: Vim9: using null values not sufficiently tested
* 8.2.4553: linear tag search is a bit slow
* 8.2.4552: in a :def function "put = expr" does not work
* 8.2.4551: when mapping <Esc> terminal codes are not recognized
* 8.2.4550: Motif: cannot set the color of the scrollbar thumb
* 8.2.4549: cannot build with Motif and editres

Author: chrisbra

gitlog.txt

@@ -1 +1 @@
-* [8.2.4548](https://github.com/vim/vim/commit/fb43cfc2c6a003b850343bfd27cb3059c734d7d4): script-local function is deleted when used in a funcref\n* [8.2.4547](https://github.com/vim/vim/commit/f52fac2ed94e6acc9612103c6c6f55660cc695c8): the neXTaw GUI is old and does not work well\n* [8.2.4546](https://github.com/vim/vim/commit/0a4e098f32f3c83273ff63c02c8d0d5cdd7c897c): duplicate #undef\n* [8.2.4545](https://github.com/vim/vim/commit/176711f06966f6691a29c410e4693bf14e0f3d74): MS-Windows: the installed icon is low resolution\n* [8.2.4544](https://github.com/vim/vim/commit/dbf8094b17781ab1db191cf690e59c79f508a50f): Coverity warnings for not using returned value\n* [8.2.4543](https://github.com/vim/vim/commit/20fb28b1dcc092787e1a7b22dcfcfe1e46e29813): Coverity warning for refactored tag search code
+* [8.2.4554](https://github.com/vim/vim/commit/badf04f5c219743cd6645ff1f1fe88badf4af4c5): Vim9: using null values not sufficiently tested\n* [8.2.4553](https://github.com/vim/vim/commit/8b530b3158cbd3aee2ad9cad8e7b7964faabb51e): linear tag search is a bit slow\n* [8.2.4552](https://github.com/vim/vim/commit/d0b7bfa95798f5ec743d8afffbffb83aeac823da): in a :def function "put = expr" does not work\n* [8.2.4551](https://github.com/vim/vim/commit/bbf84e2737daf3479e059dc7e7da0c50a07a4bf4): when mapping \<Esc> terminal codes are not recognized\n* [8.2.4550](https://github.com/vim/vim/commit/5b4f8a0e8476d57ee8a48e45171d19c1d2b4154e): Motif: cannot set the color of the scrollbar thumb\n* [8.2.4549](https://github.com/vim/vim/commit/e2adcf397421d47440d135a97765e1dbe7f824fe): cannot build with Motif and editres