sidebar: statuses wear italic instead of an indent, and can wear colour

Three columns of indent is a fifth of a sixteen-column sidebar, spent
saying 'this belongs to the row above'. The slant says it in none: a
status now starts in the same column its tab's name starts in, and is
set in italic. That also survives the monochrome themes in contrib,
where a colour-only distinction would have had nothing to spend.

tab_status_fg / tab_status_bg are there for themes that do have colour
to spend. The fg follows tab_count when a theme does not name it -- the
same declared/derived split apply_scrolled makes -- so the six themes
in contrib get coherent status rows without a line added to any of
them. The bg is unset by default, because a band is opt-in and 'none'
is what a translucent terminal wants; the row is padded so a band that
*is* set covers the row rather than the words on it.

Two things fell out. The padding loop existed three times and is now
pad_cells. And cb_color wrote #000000 for an unset colour, so
 quietly pinned attach_bg -- 'gray
ink on the terminal's own background', says its comment -- to a black
band. Unset colours are now written commented out, the same trick the
states block uses for what it wants re-derived rather than pinned.

1 files changed, 5 insertions, 1 deletions

diff --git a/contrib/themes/default.kdl b/contrib/themes/default.kdl
index 0cf881e..7c1fa23 100644
--- a/contrib/themes/default.kdl
+++ b/contrib/themes/default.kdl
@@ -38,7 +38,7 @@ theme {
     header_hover "#7aa2f7"
     header_hover_title "#ffffff"
 
-    // the strip along the top
+    // the strip along the top, or the sidebar down the side
     tab_active_fg "#141418"
     tab_active_bg "#7aa2f7"
     tab_active_hover_fg "#ffffff"
@@ -47,6 +47,10 @@ theme {
     prefix_fg "#141418"
     prefix_bg "#7aa2f7"
     tab_count "#45454a"
+    // a sidebar's status rows: italic carries the distinction, so this only
+    // has to be ambient. Unset, it follows tab_count. tab_status_bg is unset
+    // -- a band is opt-in, and none leaves a translucent terminal alone.
+    tab_status_fg "#45454a"
 
     // the line along the bottom
     status "#45454a"