vim-patch:8.2.3085: JSONC files are not recognized

Problem:    JSONC files are not recognized.
Solution:   Recognize .jsonc files. (Izhak Jakov, closes vim/vim#8500)
acbb4b5720

N/A patches for version.c:

vim-patch:8.2.3081: cannot catch errors in a channel command

Problem:    Cannot catch errors in a channel command.
Solution:   Instead of skipping the error make it silent. (closes vim/vim#8477)
11a632d60b

vim-patch:8.2.3082: a channel command "echoerr" does not show anything

Problem:    A channel command "echoerr" does not show anything.
Solution:   Do not use silent errors when using an "echoerr" command.
            (closes vim/vim#8494)
b836f631db

vim-patch:8.2.3094: Test_popup_atcursor_pos() fails without the conceal feature

Problem:    Test_popup_atcursor_pos() fails without the conceal feature.
Solution:   Add a check for the conceal feature. (Dominique Pellé,
            closes vim/vim#8505)
c60e959cba

vim-patch:8.2.3098: popup window test is flaky on MS-Windows with GUI

Problem:    Popup window test is flaky on MS-Windows with GUI.
Solution:   Skip the check in this situation.
999db2346b

runtime/filetype.vim

@@ -864,6 +864,9 @@ au BufNewFile,BufRead *.json-patch			setf json
 " Jupyter Notebook is also json
 au BufNewFile,BufRead *.ipynb				setf json
 
+" JSONC
+au BufNewFile,BufRead *.jsonc			setf jsonc
+
 " Kixtart
 au BufNewFile,BufRead *.kix			setf kix
 

src/nvim/testdir/test_filetype.vim

@@ -260,6 +260,7 @@ let s:filename_checks = {
     \ 'jovial': ['file.jov', 'file.j73', 'file.jovial'],
     \ 'jproperties': ['file.properties', 'file.properties_xx', 'file.properties_xx_xx', 'some.properties_xx_xx_file'],
     \ 'json': ['file.json', 'file.jsonp', 'file.json-patch', 'file.webmanifest', 'Pipfile.lock', 'file.ipynb'],
+    \ 'jsonc': ['file.jsonc'],
     \ 'jsp': ['file.jsp'],
     \ 'kconfig': ['Kconfig', 'Kconfig.debug', 'Kconfig.file'],
     \ 'kivy': ['file.kv'],