LibWeb: Saturate result in PixelUnits::operator/

Tests/LibWeb/TestCSSPixels.cpp

@@ -31,6 +31,11 @@ TEST_CASE(division1)
     CSSPixels b(5);
     CSSPixels c = a / b;
     EXPECT_EQ(c, CSSPixels(2));
+
+    a = CSSPixels::from_raw(0x3FFF'FFFF); // int_max / 2
+    b = 0.25;
+    EXPECT(!a.might_be_saturated());
+    EXPECT((a / b).might_be_saturated());
 }
 
 TEST_CASE(multiplication1)

Userland/Libraries/LibWeb/PixelUnits.cpp

@@ -124,9 +124,12 @@ CSSPixels CSSPixels::operator*(CSSPixels const& other) const
 
 CSSPixels CSSPixels::operator/(CSSPixels const& other) const
 {
-    CSSPixels result;
-    result.set_raw_value(static_cast<long long>(fixed_point_denominator) * raw_value() / other.raw_value());
-    return result;
+    i64 mult = raw_value();
+    mult <<= fractional_bits;
+    mult /= other.raw_value();
+
+    int int_value = AK::clamp_to_int(mult);
+    return from_raw(int_value);
 }
 
 CSSPixels& CSSPixels::operator+=(CSSPixels const& other)