Problem:    Search code not sufficiently tested.
Solution:   Add more tests. (Yegappan Lakshmanan, closes vim/vim#5999)
https://github.com/vim/vim/commit/224a5f17c6ec9e98322a4c6792ce4f9bb31a4cce

Cherry-pick test_charsearch.vim change from patch 8.2.0448.
Cherry-pick test_search.vim changes from patch 8.2.0619.

Problem:    Typos and small problems in test files.
Solution:   Small improvements.
https://github.com/vim/vim/commit/037c54f261818439755d56e318da068f97997fb5

Include unmerged patch v8.0.1200 changes
because this patch depends on `set beloff=all` removed in 1 test.

Problem:    Using "gn" after "gN" does not work.
Solution:   Extend the other end of the Visual area. (closes vim/vim#7109)
https://github.com/vim/vim/commit/c07b7f701fb30d26112051e4ec737c7e3db72357

N/A patches for version.c:

vim-patch:8.2.1834: PyEval_InitThreads() is deprecated in Python 3.9

Problem:    PyEval_InitThreads() is deprecated in Python 3.9.
Solution:   Do not call PyEval_InitThreads in Python 3.9 and later. (Ken
            Takata, closes vim/vim#7113)  Avoid warnings for functions.
https://github.com/vim/vim/commit/efc0d94afc48a03b07955e91315e7e67945cd079

Problem:    "gN" does not select the matched string.
Solution:   Move the cursor to the start of the match.
https://github.com/vim/vim/commit/28f224b2c1bd2fcdee7b4fe2c64826e1cff08f39

N/A patches for version.c:

vim-patch:8.2.1820: Vim9: crash when error happens in timer callback

Problem:    Vim9: crash when error happens in timer callback.
Solution:   Check that current_exception is not NULL. (closes vim/vim#7100)
https://github.com/vim/vim/commit/820d55a50bbc8c0ad0505b7e4302a734896b6bab

vim-patch:8.2.1829: warnings when executing Github actions

Problem:    Warnings when executing Github actions.
Solution:   Use another method to set environment variables. (Ken Takata,
            closes vim/vim#7107)
https://github.com/vim/vim/commit/bd6428b9e79ed85b54ea7eaa11871fa09d63ab6f

vim-patch:8.2.1830: MS-Windows: Python3 issue with stdin

Problem:    MS-Windows: Python3 issue with stdin.
Solution:   Check if stdin is readable. (Ken Takata, closes vim/vim#7106)
https://github.com/vim/vim/commit/c6ed254d9fda0ff54cdedce5597ff3e0d0218d18

vim-patch:8.2.1831: file missing from distribution

Problem:    File missing from distribution.
Solution:   Add the github code analyses file.
https://github.com/vim/vim/commit/ef16c90423ae579927e6294c1ccfd17c5a1c113c

Problem:    'wrapscan' is not used for "gn".
Solution:   Only reset 'wrapscan' for the first search round. (closes vim/vim#5164)
https://github.com/vim/vim/commit/82cf7f6df751505da285815a791463a049587849

Problem:    "gN" is off by one in Visual mode.
Solution:   Check moving forward. (Christian Brabandt, vim/vim#5075)
https://github.com/vim/vim/commit/453c19257f6d97904ec2e3823e88e63c983f2f9a

Problem:    "gn" doesn't work quite right. (Jaehwang Jerry Jung)
Solution:   Improve and simplify the search logic. (Christian Brabandt,
            closes vim/vim#5103, closes vim/vim#5075)
https://github.com/vim/vim/commit/edaad6e0a0e3c1fcb6a5c2771e647c52475bb19c

Problem:    "gn" selects the wrong text with a multi-line match.
Solution:   Get the end position from searchit() directly. (closes vim/vim#3695)
https://github.com/vim/vim/commit/5d24a2257e597fd752e33b2c1e9c19cf9114a517

Problem:    Using "gn" may select wrong text when wrapping.
Solution:   Avoid wrapping when searching forward. (Christian Brabandt)
https://github.com/vim/vim/commit/bdb657924d73c98b0ab28411749571e893b699a9

Problem:    "gN" doesn't work on last match with 'wrapscan' off. (fcpg)
Solution:   Adjust for searching backward. (Christian Brabandt)
https://github.com/vim/vim/commit/22ab547dc281092d6a9d397db712a11733c38e97