Apply suggestions from code review

Co-authored-by: Laurenz <laurmaedje@gmail.com>

src/geom/length.rs

@@ -108,7 +108,7 @@ impl Length {
         self.raw + 1e-6 >= other.raw
     }
 
-    /// Compares to lengths for whether they are approximately equal.
+    /// Compares two lengths for whether they are approximately equal.
     pub fn approx_eq(self, other: Self) -> bool {
         self == other || (self - other).to_raw().abs() < 1e-6
     }

src/layout/incremental.rs

@@ -101,7 +101,7 @@ pub struct FramesEntry {
     /// How nested the frame was in the context is was originally appearing in.
     pub level: usize,
     /// How much the element was accessed during the last five compilations, the
-    /// most current one being the last element. `None` variants indicate that
+    /// most recent one being the last element. `None` variants indicate that
     /// the element is younger than five compilations.
     temperature: [Option<usize>; 5],
 }

src/layout/par.rs

@@ -219,12 +219,18 @@ impl<'a> ParLayouter<'a> {
                 stack.finish_region(ctx);
             }
 
-            if !stack.regions.current.height.fits(line.size.height)
+            // If the line does not fit vertically, we start a new region.
-                && stack.regions.in_full_last()
+            while !stack.regions.current.height.fits(line.size.height) {
-            {
+                if stack.regions.in_full_last() {
                     stack.overflowing = true;
+                    break;
                 }
                 
+                stack.constraints.max.vertical.set_min(
+                    stack.full.height - stack.regions.current.height + line.size.height,
+                );
+                stack.finish_region(ctx);
+            }
             // If the line does not fit horizontally or we have a mandatory
             // line break (i.e. due to "\n"), we push the line into the
             // stack.