[vim/vim] Accept a script local variable in a function which overrides a previous block-scope variable (PR #19963)

[Yegappan Lakshmanan]

When a function is defined at the top level of a script, it should be able to see
script-local variables defined at that same level.

The find_script_var() function was missing a check for the case where uf_block_depth
is zero. Added a check to ensure sav_block_id == 0 is accepted as visible when the
function is not inside a nested block.

Fixes the issue reported in #19959.

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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/19963

Commit Summary

• af024d8 Accept a script local variable in a function which overrides a previous block-scope variable

File Changes

(2 files)

• M src/testdir/test_vim9_script.vim (22)
• M src/vim9compile.c (5)

Patch Links:

• https://github.com/vim/vim/pull/19963.patch
• https://github.com/vim/vim/pull/19963.diff

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