QTextDocumentLayout - add support for the vertical alignment QTextCharFormat::AlignDescent

diff --git a/src/gui/text/qtextdocumentlayout.cpp b/src/gui/text/qtextdocumentlayout.cpp
index bbe5fd7..4b6008a 100644
--- a/src/gui/text/qtextdocumentlayout.cpp
+++ b/src/gui/text/qtextdocumentlayout.cpp
@@ -2974,6 +2974,10 @@ void QTextDocumentLayout::resizeInlineObject(QTextInlineObject item, int posInDo
     if (f.verticalAlignment() == QTextCharFormat::AlignMiddle) {
         item.setDescent(inlineSize.height() / 2);
         item.setAscent(inlineSize.height() / 2 - 1);
+    } else if(f.verticalAlignment() == QTextCharFormat::AlignDescent) {
+          QFontMetricsF fm(f.font());
+          item.setDescent(fm.descent());
+          item.setAscent(inlineSize.height() -fm.descent() - 1);
     } else {
         item.setDescent(0);
         item.setAscent(inlineSize.height() - 1);
diff --git a/src/gui/text/qtextformat.h b/src/gui/text/qtextformat.h
index a86451c..9cb9786 100644
--- a/src/gui/text/qtextformat.h
+++ b/src/gui/text/qtextformat.h
@@ -373,7 +373,8 @@ public:
         AlignSubScript,
         AlignMiddle,
         AlignTop,
-        AlignBottom
+        AlignBottom,
+        AlignDescent
     };
     enum UnderlineStyle { // keep in sync with Qt::PenStyle!
         NoUnderline,