tdf#123728 Always print on main thread to avoid deadlocks

Change-Id: Ia8c2600aee42c3063e18032d1e485ad417ec4639
Reviewed-on: https://gerrit.libreoffice.org/68421
Tested-by: Jenkins
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
(cherry picked from commit 11080306)
Reviewed-on: https://gerrit.libreoffice.org/68461Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

sfx2/source/doc/sfxbasemodel.cxx

@@ -91,6 +91,7 @@
 #include <framework/titlehelper.hxx>
 #include <comphelper/numberedcollection.hxx>
 #include <unotools/ucbhelper.hxx>
+#include <vcl/threadex.hxx>
 
 #include <sfx2/sfxbasecontroller.hxx>
 #include <sfx2/viewfac.hxx>
@@ -1411,14 +1412,22 @@ void SAL_CALL SfxBaseModel::setPrinter(const Sequence< beans::PropertyValue >& r
     m_pData->m_xPrintable->setPrinter( rPrinter );
 }
 
+static bool ImplPrintStatic(const Reference<view::XPrintable>& m_xPrintable,
+                            const Sequence<beans::PropertyValue>& rOptions)
+{
+    m_xPrintable->print(rOptions);
+    return true;
+}
+
 void SAL_CALL SfxBaseModel::print(const Sequence< beans::PropertyValue >& rOptions)
 {
     SfxModelGuard aGuard( *this );
 
     impl_getPrintHelper();
-    m_pData->m_xPrintable->print( rOptions );
-}
 
+    // tdf#123728 Always print on main thread to avoid deadlocks
+    vcl::solarthread::syncExecute(std::bind(&ImplPrintStatic, m_pData->m_xPrintable, rOptions));
+}
 
 //  XStorable