Layout underinvalidation fixes - #11105

Tests/LibWeb/Text/input/table-colspan-change-relayout.html (1)

18-30: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Add coverage for raw <col span> changes.

This test covers only HTMLTableCellElement::col_span(). Add a <col> case that changes span from 1001 to 1002; both effective spans are 1000, but the raw spans differ. Assert the updated table-track geometry and layout delta.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@Tests/LibWeb/Text/input/table-colspan-change-relayout.html` around lines 18 -
30, Extend the test beyond the existing HTMLTableCellElement colspan case with a
raw <col span> scenario changing from 1001 to 1002. Verify the effective
table-track geometry remains 1000 while asserting the expected layout delta
after forcing layout, and retain the existing no-op coverage for equivalent cell
spans.

Tests/LibWeb/Layout/input/lang-change-casing-text-transform-relayout.html (1)

1-6: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Add coverage for the Layout::TextSliceNode path.

This test covers a regular text node under text-transform: uppercase. It does not exercise LanguageInvalidator.cpp Lines 39-43, where a language change must rebuild the layout tree for a first-letter slice. Add a ::first-letter case with a language change and update the expected dump.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@Tests/LibWeb/Layout/input/lang-change-casing-text-transform-relayout.html`
around lines 1 - 6, Extend the HTML test to include a ::first-letter
text-transform case that changes the element language from English to Turkish,
exercising the Layout::TextSliceNode path and LanguageInvalidator relayout
behavior. Update the corresponding expected layout dump to reflect the rebuilt
first-letter layout after the language change, while preserving the existing
regular-text coverage.

Tests/LibWeb/Text/input/textarea-rows-attribute-relayout.html (1)

11-15: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Cover cols changes in this regression test.

The test changes only rows, but Libraries/LibWeb/HTML/HTMLTextAreaElement.cpp handles both rows and cols on Lines 449-455. Add a cols mutation and verify that the width grows. This prevents a regression in the column-size path from passing unnoticed.

Proposed test extension

         const heightAfter = document.getElementById("field").getBoundingClientRect().height;
+        const widthBefore = document.getElementById("field").getBoundingClientRect().width;
+        document.getElementById("field").setAttribute("cols", "40");
+        const widthAfter = document.getElementById("field").getBoundingClientRect().width;
 
-        println(`grew: ${heightAfter > heightBefore}`);
+        println(`grew: ${heightAfter > heightBefore && widthAfter > widthBefore}`);

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@Tests/LibWeb/Text/input/textarea-rows-attribute-relayout.html` around lines
11 - 15, Extend the regression test around the existing field measurements to
cover the cols mutation as well as rows: record the textarea width before
changing cols, set the cols attribute to a larger value, record the width after,
and print/assert that the width increased. Keep the existing rows height-growth
check unchanged and use the same field element.