[vim/vim] Add tabpanel_getinfo() and tabpanel_scroll() (PR #20056)

[mattn]

Expose the tabpanel scroll state to Vim script.

• `tabpanel_getinfo()` returns a dict with `align`, `columns`, `scroll`, `scrollbar`, `offset`, `total`, `max_offset`.
• `tabpanel_scroll({n})` scrolls by `n` rows (positive down, negative up). With `{absolute: v:true}` the argument becomes the new offset instead of a delta. The offset is clamped to the valid range; returns true when it actually changes.

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

  https://github.com/vim/vim/pull/20056

Commit Summary

• aaff1a3 Add tabpanel_getinfo() and tabpanel_scroll()

File Changes

(5 files)

• M runtime/doc/builtin.txt (35)
• M src/evalfunc.c (9)
• M src/proto/tabpanel.pro (3)
• M src/tabpanel.c (94)
• M src/testdir/test_tabpanel.vim (54)

Patch Links:

• https://github.com/vim/vim/pull/20056.patch
• https://github.com/vim/vim/pull/20056.diff

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