SplitView: Fix bug when showing SplitView late
SplitView: Fix bug when showing SplitView late

If the SplitView was initially hidden, and told to
show later, the handles ended up at wrong positions.
This patch will fix this.

Change-Id: Ia21fa1efcf30c36bf18e0d4f3ab0813c6b79afcc
Reviewed-by: J-P Nurmi <b84a892f57a298bb5dae653b4e188948a84d5549@digia.com>

richardmg/qtcomponents,kobolabs/qtquickcontrols,richardmg/qtcomponents,kobolabs/qtquickcontrols,kobolabs/qtquickcontrols,drgvond/qtquickcontrols,drgvond/qtquickcontrols,drgvond/qtquickcontrols,mizukusak/qtquickcontrols,mizukusak/qtquickcontrols,richardmg/qtcomponents,jfaust/qtquickcontrols,jfaust/qtquickcontrols,jfaust/qtquickcontrols,mizukusak/qtquickcontrols