layout: Use BoxFragment border widths for display list generation (#…

…31292)

Instead of using the border widths from the style, use the ones recorded
by the `BoxFragment`. This is necessary because inline layout can
override these border widths during fragmentation. For instance, when a
box is split across two lines only one fragment should have an inline
start border.

components/layout_2020/display_list/mod.rs

@@ -685,11 +685,15 @@ impl<'a> BuilderForBoxFragment<'a> {
 
     fn build_border(&mut self, builder: &mut DisplayListBuilder) {
         let border = self.fragment.style.get_border();
+        let border_widths = self
+            .fragment
+            .border
+            .to_physical(self.fragment.style.writing_mode);
         let widths = SideOffsets2D::new(
-            border.border_top_width.to_f32_px(),
-            border.border_right_width.to_f32_px(),
-            border.border_bottom_width.to_f32_px(),
-            border.border_left_width.to_f32_px(),
+            border_widths.top.px(),
+            border_widths.right.px(),
+            border_widths.bottom.px(),
+            border_widths.left.px(),
         );
         if widths == SideOffsets2D::zero() {
             return;

components/layout_2020/flow/line.rs

@@ -302,11 +302,6 @@ impl InlineBoxLineItem {
             border.inline_start = Length::zero();
             margin.inline_start = Length::zero();
         }
-        if !self.is_last_fragment_of_ib_split {
-            padding.inline_end = Length::zero();
-            border.inline_end = Length::zero();
-            margin.inline_end = Length::zero();
-        }
         let pbm_sums = &(&padding + &border) + &margin;
         state.inline_position += pbm_sums.inline_start;