LibWeb: Ignore only anonymous blocks in block auto height calculation

Previously block auto height calculation was changed to skip boxes with
collapsed margins and then condition to skip anonymous boxes with no
lines was also removed in 6c5ba10bb025e863a0567c5b1f6110f2b0233108 to
avoid skipping anonymous wrappers of tables.

Skipping boxes with collapsed margins (currently it's check that
height is 0) is wrong because it makes empty boxes with clearance to
be skipped which is not correct while anonymous boxes with no lines
should be skipped and it's no longer causes problems with tables
(fixed in 87f0e835eb7fee2af95a365f29113f315571a755)

Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp

@@ -432,9 +432,9 @@ CSSPixels BlockFormattingContext::compute_auto_height_for_block_level_element(Bo
 
             auto const& child_box_state = m_state.get(*child_box);
 
-            if (margins_collapse_through(*child_box, m_state)) {
+            // Ignore anonymous block containers with no lines. These don't count as in-flow block boxes.
+            if (child_box->is_anonymous() && child_box->is_block_container() && child_box_state.line_boxes.is_empty())
                 continue;
-            }
 
             auto margin_bottom = m_margin_state.current_collapsed_margin();
             if (box_state.padding_bottom == 0 && box_state.border_bottom == 0) {