3 files changed, 18 insertions, 2 deletions
diff --git a/src/extension/effect.cpp b/src/extension/effect.cpp
index ef254f623..38e437ac9 100644
--- a/src/extension/effect.cpp
+++ b/src/extension/effect.cpp
@@ -352,6 +352,12 @@ Effect::get_info_widget(void)
     return Extension::get_info_widget();
 }
 
+PrefDialog *
+Effect::get_pref_dialog (void)
+{
+    return _prefDialog;
+}
+
 void
 Effect::set_pref_dialog (PrefDialog * prefdialog)
 {
diff --git a/src/extension/effect.h b/src/extension/effect.h
index a14cc6e7d..143243a2e 100644
--- a/src/extension/effect.h
+++ b/src/extension/effect.h
@@ -125,6 +125,7 @@ public:
     bool no_doc; // if true, the effect does not process SVG document at all, so no need to save, read, and watch for errors
     bool no_live_preview; // if true, the effect does not need "live preview" checkbox in its dialog
 
+    PrefDialog *get_pref_dialog (void);
     void        set_pref_dialog (PrefDialog * prefdialog);
 private:
     static gchar *   remove_ (gchar * instr);
diff --git a/src/extension/execution-env.cpp b/src/extension/execution-env.cpp
index f75b06937..588543a76 100644
--- a/src/extension/execution-env.cpp
+++ b/src/extension/execution-env.cpp
@@ -12,7 +12,8 @@
 #include <config.h>
 #endif
 
-#include "gtkmm/messagedialog.h"
+#include <gtkmm/dialog.h>
+#include <gtkmm/messagedialog.h>
 
 #include "execution-env.h"
 #include "prefdialog.h"
@@ -141,7 +142,15 @@ ExecutionEnv::createWorkingDialog (void) {
     g_free(dlgmessage);
 
     if (!_effect->is_silent()){
-        _visibleDialog->show();
+        Gtk::Dialog *dlg = _effect->get_pref_dialog();
+        if (dlg) {
+            _visibleDialog->set_transient_for(*dlg);
+        } else {
+            // ToDo: Do we need to make the window transient for the main window here?
+            //       Currently imossible to test because of GUI freezing during save,
+            //       see https://bugs.launchpad.net/inkscape/+bug/967416
+        }
+        _visibleDialog->show_now();
     }
 
     return;