tdf#113380: if the player doesn't exist,...

... use the same size as VLC does.

See:
https://opengrok.libreoffice.org/xref/core/avmedia/source/vlc/vlcplayer.cxx#167

Change-Id: Ib878ded6c8aacf3a04227ab9efaa59b388f8ff51
Reviewed-on: https://gerrit.libreoffice.org/43827Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

avmedia/source/framework/mediaplayer.cxx

@@ -53,7 +53,7 @@ MediaFloater::MediaFloater( SfxBindings* _pBindings, SfxChildWindow* pCW, vcl::W
     SfxDockingWindow( _pBindings, pCW, pParent, WB_CLOSEABLE | WB_MOVEABLE | WB_SIZEABLE | WB_DOCKABLE ),
     mpMediaWindow( new MediaWindow( this, true ) )
 {
-    const Size aSize( 378, 256 );
+    const Size aSize( mpMediaWindow->getPreferredSize() );
 
     SetPosSizePixel( Point( 0, 0 ), aSize );
     SetMinOutputSizePixel( aSize );

avmedia/source/viewer/mediawindow_impl.cxx

@@ -290,7 +290,7 @@ bool MediaWindowImpl::isValid() const
 
 Size MediaWindowImpl::getPreferredSize() const
 {
-    Size aRet;
+    Size aRet(480, 360);
 
     if( mxPlayer.is() )
     {