Clip the start position when performing SVG text queries

Source/core/rendering/svg/SVGTextQuery.cpp

Index: Source/core/rendering/svg/SVGTextQuery.cpp
diff --git a/Source/core/rendering/svg/SVGTextQuery.cpp b/Source/core/rendering/svg/SVGTextQuery.cpp
index d73c2d1ec5c67f1817e54aade8c4e7c61c3924b9..f5ead0d43661f2ec0f636f48021b511100a0b748 100644
--- a/Source/core/rendering/svg/SVGTextQuery.cpp
+++ b/Source/core/rendering/svg/SVGTextQuery.cpp
@@ -141,7 +141,9 @@ bool SVGTextQuery::mapStartEndPositionsIntoFragmentCoordinates(Data* queryData,
     startPosition -= queryData->processedCharacters;
     endPosition -= queryData->processedCharacters;
 
-    if (startPosition >= endPosition || startPosition < 0 || endPosition < 0)
+    startPosition = max(0, startPosition);
+
+    if (startPosition >= endPosition)
         return false;
 
     modifyStartEndPositionsRespectingLigatures(queryData, startPosition, endPosition);