render: preserve inline block inner flow

crates/obscura-render/src/lib.rs

@@ -165,6 +165,10 @@ impl Dimension {
 #[derive(Debug, Clone, Default)]
 pub struct LayoutStyle {
     pub display: Display,
+    /// True when `display:flex` is only an internal stand-in for native HTML
+    /// layout such as table cells or `<center>`, rather than the computed CSS
+    /// display. Descendants are not CSS flex items in these containers.
+    pub internal_flex_container: bool,
     pub width: Dimension,
     pub height: Dimension,
     /// Which box edge `width`/`height` and min/max sizes describe. CSS starts