[gimp] app: attach the "Reset all filters" dialog to Gimp

[Michael Natterer <mitch src gnome org>]

commit 99319182b7ce96aaeacca73f67cec1c698b6a287
Author: Michael Natterer <mitch gimp org>
Date:   Sun Sep 25 20:32:50 2016 +0200

    app: attach the "Reset all filters" dialog to Gimp
    
    so it's not shown multiple times.

 app/actions/plug-in-commands.c |   49 ++++++++++++++++++++++++++--------------
 1 files changed, 32 insertions(+), 17 deletions(-)
---
diff --git a/app/actions/plug-in-commands.c b/app/actions/plug-in-commands.c
index 4092228..7ccfecb 100644
--- a/app/actions/plug-in-commands.c
+++ b/app/actions/plug-in-commands.c
@@ -49,6 +49,8 @@
 #include "widgets/gimpmessagebox.h"
 #include "widgets/gimpmessagedialog.h"
 
+#include "dialogs/dialogs.h"
+
 #include "actions.h"
 #include "plug-in-commands.h"
 #include "procedure-commands.h"
@@ -164,31 +166,44 @@ plug_in_reset_all_cmd_callback (GtkAction *action,
   GtkWidget *dialog;
   return_if_no_gimp (gimp, data);
 
-  dialog = gimp_message_dialog_new (_("Reset all Filters"), GIMP_STOCK_QUESTION,
-                                    NULL, 0,
-                                    gimp_standard_help_func, NULL,
+#define RESET_FILTERS_DIALOG_KEY "gimp-reset-all-filters-dialog"
+
+  dialog = dialogs_get_dialog (G_OBJECT (gimp), RESET_FILTERS_DIALOG_KEY);
+
+  if (! dialog)
+    {
+      dialog = gimp_message_dialog_new (_("Reset all Filters"),
+                                        GIMP_STOCK_QUESTION,
+                                        NULL, 0,
+                                        gimp_standard_help_func, NULL,
+
+                                        GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
+                                        GIMP_STOCK_RESET, GTK_RESPONSE_OK,
 
-                                    GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
-                                    GIMP_STOCK_RESET, GTK_RESPONSE_OK,
+                                        NULL);
 
-                                    NULL);
+      gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
+                                               GTK_RESPONSE_OK,
+                                               GTK_RESPONSE_CANCEL,
+                                               -1);
 
-  gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
-                                           GTK_RESPONSE_OK,
-                                           GTK_RESPONSE_CANCEL,
-                                           -1);
+      g_signal_connect (dialog, "response",
+                        G_CALLBACK (plug_in_reset_all_response),
+                        gimp);
 
-  g_signal_connect (dialog, "response",
-                    G_CALLBACK (plug_in_reset_all_response),
-                    gimp);
+      gimp_message_box_set_primary_text (GIMP_MESSAGE_DIALOG (dialog)->box,
+                                         _("Do you really want to reset all "
+                                           "filters to default values?"));
 
-  gimp_message_box_set_primary_text (GIMP_MESSAGE_DIALOG (dialog)->box,
-                                     _("Do you really want to reset all "
-                                       "filters to default values?"));
+      dialogs_attach_dialog (G_OBJECT (gimp), RESET_FILTERS_DIALOG_KEY, dialog);
+    }
 
-  gtk_widget_show (dialog);
+  gtk_window_present (GTK_WINDOW (dialog));
 }
 
+
+/*  private functions  */
+
 static void
 plug_in_reset_all_response (GtkWidget *dialog,
                             gint       response_id,