sfx2: fix valgrind warning

==7727== Conditional jump or move depends on uninitialised value(s)
==7727==    at 0x9121E24: SfxDockingWindow::Resize() (dockwin.cxx:451)
==7727==    by 0x3CADFAC3: SmElementsDockingWindow::Resize()
(ElementsDockingWindow.cxx:753)

Change-Id: Ie6e8a61f6c295373e5ccad409e2557e7c2dd6c1a
(cherry picked from commit 88312819)
(cherry picked from commit 5d9a20b3)
Reviewed-on: https://gerrit.libreoffice.org/20756Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
(cherry picked from commit a3eb2cfd)

sfx2/source/dialog/dockwin.cxx

@@ -858,6 +858,7 @@ SfxDockingWindow::SfxDockingWindow( SfxBindings *pBindinx, SfxChildWindow *pCW,
     pImp->nLine = pImp->nDockLine = 0;
     pImp->nPos  = pImp->nDockPos = 0;
     pImp->bNewLine = false;
+    pImp->SetDockAlignment(SfxChildAlignment::NOALIGNMENT);
     pImp->SetLastAlignment(SfxChildAlignment::NOALIGNMENT);
     pImp->aMoveIdle.SetPriority(SchedulerPriority::RESIZE);
     pImp->aMoveIdle.SetIdleHdl(LINK(this,SfxDockingWindow,TimerHdl));
@@ -903,6 +904,7 @@ SfxDockingWindow::SfxDockingWindow( SfxBindings *pBindinx, SfxChildWindow *pCW,
     pImp->nLine = pImp->nDockLine = 0;
     pImp->nPos  = pImp->nDockPos = 0;
     pImp->bNewLine = false;
+    pImp->SetDockAlignment(SfxChildAlignment::NOALIGNMENT);
     pImp->SetLastAlignment(SfxChildAlignment::NOALIGNMENT);
     pImp->aMoveIdle.SetPriority(SchedulerPriority::RESIZE);
     pImp->aMoveIdle.SetIdleHdl(LINK(this,SfxDockingWindow,TimerHdl));
@@ -948,6 +950,7 @@ SfxDockingWindow::SfxDockingWindow( SfxBindings *pBindinx, SfxChildWindow *pCW,
     pImp->nLine = pImp->nDockLine = 0;
     pImp->nPos  = pImp->nDockPos = 0;
     pImp->bNewLine = false;
+    pImp->SetDockAlignment(SfxChildAlignment::NOALIGNMENT);
     pImp->SetLastAlignment(SfxChildAlignment::NOALIGNMENT);
     pImp->aMoveIdle.SetPriority(SchedulerPriority::RESIZE);
     pImp->aMoveIdle.SetIdleHdl(LINK(this,SfxDockingWindow,TimerHdl));