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Hirohito Higashi
2d43240659
Problem: Several issues around the tabpanel scrollbar:
1. :set tabpanelopt= completion did not offer "scroll" and
"scrollbar".
2. gt/gT and other tab switches did not update the scrollbar
thumb; the current tab could move outside the visible
panel range without the view following.
3. When tpl_scroll_offset was at its maximum, the thumb's
bottom did not reach the last screen row due to integer
truncation in thumb_top (e.g. 31 tabs on 24 rows + :tablast
left a one-row gap).
4. For align:right the scrollbar was drawn on the panel's
left edge (adjacent to the buffer area), which breaks the
common convention that a vertical scrollbar sits on the
right.
Solution: - Add "scroll" and "scrollbar" to the 'tabpanelopt' expansion
list. Cover the completion in test_options.vim and extend
util/gen_opt_test.vim with the new valid/invalid values;
drop the now-redundant acceptance test from
test_tabpanel.vim.
- In draw_tabpanel(), remember the last-drawn curtab and,
when it changes, adjust tpl_scroll_offset so curtab_row
falls inside [offset, offset + Rows). Mouse wheel and
drag leave curtab unchanged, so the user's chosen offset
is preserved.
- In draw_tabpanel_scrollbar(), compute thumb_top as
(Rows - thumb_height) * tpl_scroll_offset
/ (tpl_total_rows - Rows), mirroring the mapping already
used by tabpanel_drag_scrollbar(). This guarantees the
thumb's bottom reaches the last row at the maximum offset.
- In draw_tabpanel(), place the scrollbar at the tabpanel's
right edge for both align:left and align:right (previously
align:right put it on the panel's left edge next to the
vertical separator). For align:right this means the
scrollbar now sits at the screen's right edge.
- Update :h tabpanel-scroll to describe the new, align-
independent placement.
- Add Test_tabpanel_scrollbar_follows_curtab() and
Test_tabpanel_scrollbar_reaches_bottom() to exercise the
regressions fixed by items 2 and 3.
closes: #20052
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Signed-off-by: Hirohito Higashi <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
