ASSERTION FAILED: lineEndingEllipsisPolicy != LineEndingEllipsisPolic…

…y::WhenContentOverflowsInInlineDirection || truncateRight.has_value() || right(boxes.last()) == visualRightForContentEnd /app/webkit/Source/WebCore/layout/formattingContexts/inline/displ

https://bugs.webkit.org/show_bug.cgi?id=262262
<rdar://problem/116503519>

Reviewed by Antti Koivisto.

Zero width content should never need ellipsis.

* LayoutTests/fast/text/overflow-ellipsis-on-empty-content-expected.txt: Added.
* LayoutTests/fast/text/overflow-ellipsis-on-empty-content.html: Added.
* Source/WebCore/layout/formattingContexts/inline/display/InlineDisplayLineBuilder.cpp:
(WebCore::Layout::InlineDisplayLineBuilder::trailingEllipsisVisualRectAfterTruncation):

Canonical link: https://commits.webkit.org/276089@main

LayoutTests/fast/text/overflow-ellipsis-on-empty-content-expected.txt

@@ -0,0 +1,2 @@
+PASS if no assert in debug.
+

LayoutTests/fast/text/overflow-ellipsis-on-empty-content.html

@@ -0,0 +1,16 @@
+<style>
+.outer {
+  width: 100px;
+  text-indent: 101px hanging;
+}
+.inner {
+  text-overflow: ellipsis;
+  overflow: hidden;
+}
+</style>
+PASS if no assert in debug.
+<div class=outer><div class=inner><span><div></div></span></div>
+<script>
+if (window.testRunner)
+  testRunner.dumpAsText();
+</script>

Source/WebCore/layout/formattingContexts/inline/display/InlineDisplayLineBuilder.cpp

@@ -294,7 +294,7 @@ std::optional<FloatRect> InlineDisplayLineBuilder::trailingEllipsisVisualRectAft
         case LineEndingEllipsisPolicy::NoEllipsis:
             return false;
         case LineEndingEllipsisPolicy::WhenContentOverflowsInInlineDirection:
-            return displayLine.contentLogicalWidth() > displayLine.lineBoxLogicalRect().width();
+            return displayLine.contentLogicalWidth() && displayLine.contentLogicalWidth() > displayLine.lineBoxLogicalRect().width();
         case LineEndingEllipsisPolicy::WhenContentOverflowsInBlockDirection:
             if (isLastLineWithInlineContent)
                 return false;