Bars now render top+bottom bright separators (not just outward edge) so
the sbar's bottom and cbar's top read as proper chrome regardless of
what the adjacent dapui pane puts in its winbar. Fixes the "top bar's
bottom border is the wrong color" reading where the sbar's inward edge
was falling back to dapui's grey pane-title row.
Adds `ensure_bar_heights()` to un-squish bars that nvim compressed to 0
rows (not closed — just hidden) when bufferline's tabline reclaims a
row on buffer-count change. `winfixheight` is a preference, not a
guarantee; when the grid has to give up a row, nvim sometimes picks a
`winfixheight` window anyway. Wire into VimResized + WinResized so the
bar pops back on every geometry shift.
Also add `WinBar:WinBar,WinBarNC:WinBar` to the dapui winhighlight
strings (and apply it as an initial baseline in set_dapui_window_opts)
so pane titles stay bright on themes that dim WinBarNC.
swaits
c02021ad5e