Gaps: the bar's top edge lands where the panes' sides do

The top gap read 13 against 12 everywhere else. The rims are not to
blame — left and top ramp identically — it is the groove along a
control's UPPER edge reading a pixel deeper under the DE's top-left
light than the one down its side. So the bar gets a trim of its own for
that edge, and the band height follows it up, or the pixel saved above
the items just reappears below them.

Measured after: the bar items' top edge sits at y=20, the same inset the
panes' left edge sits at, and the gap above and below the bar is 12 at
every column checked (the icon button and three points across the
switchers).

Honest about what is left: the bar items' LEFT and RIGHT edges still sit
a pixel inside the panes' (21 against 20). A carved silhouette cannot be
aligned to a flat one on all four sides by a single outset — widening it
to fix the outer edges closes the gap between the two switchers by twice
as much. Making the bar items flat plates rather than carved ones is the
real fix, and needs toolkit support the control rung does not have.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

 src/main.rs | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 185f113..f231ed1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -624,6 +624,13 @@ const OPTICAL_TRIM: f32 = 1.0;
 /// 14, so the groove is worth about half a pixel a side.
 const CARVE_TRIM: f32 = 0.5;
 
+/// And one more for the bar's TOP edge alone. Under the DE's top-left light
+/// the groove along a control's upper edge reads a pixel deeper than the one
+/// down its side, so an item placed on the same inset as the window's left and
+/// right left 13px of plate above it against 12 beside it. The band height
+/// below follows it, or the gap it opens at the top just moves underneath.
+const TOP_TRIM: f32 = 1.0;
+
 /// The menubar band's height. One padding above its items, which then sit
 /// flush with the band's bottom edge, so the gap from an item down to the
 /// plates below is that same padding again (`list_geom` adds it). That is
@@ -631,8 +638,10 @@ const CARVE_TRIM: f32 = 0.5;
 /// items, items to plates, plates to rim.
 fn menubar_h() -> f32 {
     // The items' rects run CARVE_TRIM past the box they appear to fill, so the
-    // band has to clear that or the plates below sit a pixel too close.
-    window_pad() + BAR_ITEM_H + CARVE_TRIM
+    // band has to clear that or the plates below sit a pixel too close; and it
+    // follows TOP_TRIM up, so raising the items does not just move the extra
+    // pixel from above them to below.
+    window_pad() - TOP_TRIM + BAR_ITEM_H + CARVE_TRIM
 }
 
 /// A bar item's widget rect, from the box its plate should appear to fill:
@@ -4781,12 +4790,12 @@ impl Application for ClearEmailApp {
             // that to the rect the widget needs so the carve does not push the
             // silhouette off the grid the panes sit on.
             let (edge, gap) = (window_pad(), pane_gap());
-            let (rx, ry, rw, rh) = bar_item_rect(edge, edge, BAR_ITEM_H);
+            let (rx, ry, rw, rh) = bar_item_rect(edge, edge - TOP_TRIM, BAR_ITEM_H);
             self.mail_button.set_rect(rx, ry, rw, rh);
             let folder_x = w_f32 - edge - FOLDER_W;
-            let (rx, ry, rw, rh) = bar_item_rect(folder_x, edge, FOLDER_W);
+            let (rx, ry, rw, rh) = bar_item_rect(folder_x, edge - TOP_TRIM, FOLDER_W);
             self.folder_dropdown.set_rect(rx, ry, rw, rh);
-            let (rx, ry, rw, rh) = bar_item_rect(folder_x - gap - ACCOUNT_W, edge, ACCOUNT_W);
+            let (rx, ry, rw, rh) = bar_item_rect(folder_x - gap - ACCOUNT_W, edge - TOP_TRIM, ACCOUNT_W);
             self.account_dropdown.set_rect(rx, ry, rw, rh);
 
             cce_ui::scale::set_scale_factor(scale as f32);