Complete documentation for QStyleOptionHeaderV2

Document the isSectionDragTarget variable, and add \inmodule command.
Put code and documentation together.

Amends 4c6579eacd.

Pick-to: 6.1
Change-Id: Id8837ca75cd6af13c8dc4c028b304b279e507ade
Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de>

src/widgets/styles/qstyleoption.cpp

@@ -752,28 +752,6 @@ QStyleOptionHeader::QStyleOptionHeader(int version)
 {
 }
 
-/*!
-    \class QStyleOptionHeaderV2
-    \brief The QStyleOptionHeaderV2 class is used to describe the
-    parameters for drawing a header.
-*/
-
-/*!
-    Constructs a QStyleOptionHeaderV2, initializing the members
-    variables to their default values.
-*/
-QStyleOptionHeaderV2::QStyleOptionHeaderV2()
-    : QStyleOptionHeaderV2(QStyleOptionHeader::Version)
-{
-}
-
-/*!
-    \internal
-*/
-QStyleOptionHeaderV2::QStyleOptionHeaderV2(int version)
-: QStyleOptionHeader(version), textElideMode(Qt::ElideNone), isSectionDragTarget(false), unused(0)
-{}
-
 /*!
     \variable QStyleOptionHeader::orientation
     \brief the header's orientation (horizontal or vertical)
@@ -913,6 +891,30 @@ QStyleOptionHeaderV2::QStyleOptionHeaderV2(int version)
     \sa sortIndicator
 */
 
+/*!
+    \class QStyleOptionHeaderV2
+    \brief The QStyleOptionHeaderV2 class is used to describe the
+    parameters for drawing a header.
+
+    \inmodule QtWidgets
+*/
+
+/*!
+    Constructs a QStyleOptionHeaderV2, initializing the members
+    variables to their default values.
+*/
+QStyleOptionHeaderV2::QStyleOptionHeaderV2()
+    : QStyleOptionHeaderV2(QStyleOptionHeader::Version)
+{
+}
+
+/*!
+    \internal
+*/
+QStyleOptionHeaderV2::QStyleOptionHeaderV2(int version)
+: QStyleOptionHeader(version), textElideMode(Qt::ElideNone), isSectionDragTarget(false), unused(0)
+{}
+
 /*!
     \variable QStyleOptionHeaderV2::textElideMode
     \brief where ellipsis should be added for text that is too long to fit
@@ -923,6 +925,15 @@ QStyleOptionHeaderV2::QStyleOptionHeaderV2(int version)
     \sa Qt::TextElideMode
 */
 
+/*!
+    \variable QStyleOptionHeaderV2::isSectionDragTarget
+
+    \brief whether the section is the location at which a dragged section
+    will be inserted
+
+    \sa QHeaderView::setSectionsMovable
+*/
+
 /*!
     \class QStyleOptionButton
     \brief The QStyleOptionButton class is used to describe the