DockWidgets: Allow to have floating dockwidgets side by side

Based on what MS VisualStudio can do, allow to have. We can now
drop the QDockWidgets on floating ones so that they are next to eachother

This is activated when QMainWindow::GroupedDragging and
QMainWindow::AllowNestedDocks are both set.

[ChangeLog][QtWidgets][QDockWidget] When QMainWindow::GrouppedDragging
and QMainWindow::AllowNestedDocks are both enabled, floating dock widgets
acquired the ability to be dropped together side by side.

Change-Id: I48765c72ef80ef15aa31b91ae582cbb01dea41d6
Reviewed-by: Sérgio Martins <sergio.martins@kdab.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/widgets/widgets/qdockarealayout_p.h b/src/widgets/widgets/qdockarealayout_p.h
index e9bd661cbd..e4cdc9f296 100644
--- a/src/widgets/widgets/qdockarealayout_p.h
+++ b/src/widgets/widgets/qdockarealayout_p.h
@@ -182,6 +182,7 @@ public:
                             const QPoint &mouse) const;
     QRegion separatorRegion() const;
     int separatorMove(int index, int delta);
+    int separatorMove(const QList<int> &separator, const QPoint &origin, const QPoint &dest);
 
     QLayoutItem *itemAt(int *x, int index) const;
     QLayoutItem *takeAt(int *x, int index);
@@ -248,7 +249,7 @@ public:
 
     QList<int> indexOfPlaceHolder(const QString &objectName) const;
     QList<int> indexOf(QWidget *dockWidget) const;
-    QList<int> gapIndex(const QPoint &pos) const;
+    QList<int> gapIndex(const QPoint &pos, bool disallowTabs) const;
     QList<int> findSeparator(const QPoint &pos) const;
 
     QDockAreaLayoutItem &item(const QList<int> &path);