Say the window when the window is why a drawing was refused

`AxisHolds` is four contracts, and `diag::outside` counted three: a refusal
because this window is outside the range the drawing was made for bumped
"reuse outside: a rel base". The two are different questions -- a window
range is pixels, a rel base pin is a window-unit length that an unchanged
window can still change -- so the rig answered "why did that redraw?" with
the wrong one for every resize.

core/src/layout_diagnostics.rs

@@ -72,6 +72,7 @@ labelled! {
         TextBreaks = "text line breaks",
         GlyphPlacements = "glyph placements",
         OutsidePinnedLen = "reuse outside: the length it was pinned to",
+        OutsideWindow = "reuse outside: this window",
         OutsideRelBase = "reuse outside: a rel base",
         OutsideRegion = "reuse outside: a region length",
     }
@@ -352,7 +353,7 @@ pub(crate) fn reuse(id: WidgetId, outcome: ReuseOutcome) {
 }
 
 /// A drawing that cannot be reused because the box on offer is outside what
-/// it holds for, and which of the three contracts said so. They overlap: a
+/// it holds for, and which of the four contracts said so. They overlap: a
 /// drawing can be outside two of them at once, and counting each is what
 /// says where a rel base redrawing more than it should is coming from.
 pub(crate) fn outside(
@@ -369,10 +370,12 @@ pub(crate) fn outside(
         if holds.region_len.is_some_and(|pinned| pinned != len) {
             bump(Counter::OutsidePinnedLen);
         }
-        if !holds.window.contains(window)
-            || holds
-                .rel_base
-                .is_some_and(|pinned| pinned != rel_base[axis])
+        if !holds.window.contains(window) {
+            bump(Counter::OutsideWindow);
+        }
+        if holds
+            .rel_base
+            .is_some_and(|pinned| pinned != rel_base[axis])
         {
             bump(Counter::OutsideRelBase);
         }