[vim/vim] 'make test_spell' fails if there is a personal .spl file (Issue #20765)

[Jun-ichi TAKIMOTO]

Jun-T created an issue (vim/vim#20765)

Steps to reproduce

1. Create a personal .spl file in ~/.vim/spell/. For example, in vim, while spell-checking, use the 'zg' command to add a word. This will create ~/.vim/spell/LL.EEE.add.spl (depending on LANGAGE/ENCODING you are using).
2. Checkout git master, and build vim.
3. In the directory vim/src, run 'make test_spell'. then the test will fail as:

Found errors in Test_spellinfo():
command line..script /Users/takimoto/dev/src/vim/vim/src/testdir/runtest.vim[636]..function RunTheTest[63]..Test_spellinfo line 11: Pattern '^\nfile: ../../runtime/spell/en.utf-8.spl\n$' does not match '\nfile: /Users/takimoto/.vim/spell/en.utf-8.add.spl\nfile: ../../runtime/spell/en.utf-8.spl\n'

As can be seen, ~/.vim/spell/LL.EEE.add.spl is also listed by the 'spellinfo' command.
I think the problem is in the following line:
https://github.com/vim/vim/blob/834b8d218f1db92e587ecd449e5ce88b41fbe256/src/testdir/test_spell.vim#L1609
It seems 'set runtimepath&' adds ~/.vim/ to runtimepath .
Save/restore runtimepth in Test_spelldump_prefixtree_overflow() should work, or any easier fix?

Expected behaviour

Test succeeds.

Version of Vim

9.2.0662 or newer

Environment

macOS (I believe version doesn't matter)
Apple's Terminal.app
xterm-256color
zsh

Logs and stack traces

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