tdf#102031 Expand collapsed deck when sidebar docking window gets focus

SidebarDockingWindow::GetFocus hides focus when deck is in collapsed
state so request open deck before setting focus to deck/panel title

Change-Id: I7d7f6d940a3722eb02e6356c069c4d9df9642326
Reviewed-on: https://gerrit.libreoffice.org/58712Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sfx2/source/sidebar/SidebarDockingWindow.cxx

@@ -74,7 +74,10 @@ void SidebarDockingWindow::DoDispose()
 void SidebarDockingWindow::GetFocus()
 {
     if (mpSidebarController.is())
+    {
+        mpSidebarController->RequestOpenDeck();
         mpSidebarController->GetFocusManager().GrabFocus();
+    }
     else
         SfxDockingWindow::GetFocus();
 }