Bug 797570 Import Customers/Vendors, Bills/Invoices: dialog with not imported rows does not expand with window size

In the import of Customer/Vendors en Bills/Invoice, the dialog that lists rows that were not imported shows a scrollable view of only four rows.
The view does not use the available space of the window, and does not expand with resizing the window. This change fixes this issue.
In the same functionalities, the dialog for a user defined regular expression has a similar issue. This changes also fixes that issue.

gnucash/import-export/bi-import/dialog-bi-import-gui.c

@@ -425,14 +425,14 @@ gnc_input_dialog (GtkWidget *parent, const gchar *title, const gchar *msg, const
 
     // add a label
     label = gtk_label_new (msg);
-    gtk_container_add (GTK_CONTAINER (content_area), label);
+    gtk_box_pack_start(GTK_BOX(content_area), label, FALSE, FALSE, 0);
 
     // add a textview
     view = gtk_text_view_new ();
     gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (view), GTK_WRAP_WORD_CHAR);
     buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
     gtk_text_buffer_set_text (buffer, default_input, -1);
-    gtk_container_add (GTK_CONTAINER (content_area), view);
+    gtk_box_pack_start(GTK_BOX(content_area), view, TRUE, TRUE, 0);
 
     // run the dialog
     gtk_widget_show_all (dialog);
@@ -482,11 +482,10 @@ gnc_info2_dialog (GtkWidget *parent, const gchar *title, const gchar *msg)
 
     // add a scroll area
     scrolledwindow = gtk_scrolled_window_new (NULL, NULL);
-    gtk_container_add (GTK_CONTAINER (content_area), scrolledwindow);
+    gtk_box_pack_start(GTK_BOX(content_area), scrolledwindow, TRUE, TRUE, 0);
 
     // add a textview
     view = gtk_text_view_new ();
-//    gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (view), GTK_WRAP_WORD_CHAR);
     gtk_text_view_set_editable (GTK_TEXT_VIEW (view), FALSE);
     buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
     gtk_text_buffer_set_text (buffer, msg, -1);

gnucash/import-export/customer-import/dialog-customer-import-gui.c

@@ -387,15 +387,15 @@ gnc_input_dialog (GtkWidget *parent, const gchar *title, const gchar *msg, const
 
     // add a label
     label = gtk_label_new (msg);
-    gtk_container_add (GTK_CONTAINER (content_area), label);
+    gtk_box_pack_start(GTK_BOX(content_area), label, FALSE, FALSE, 0);
 
     // add a textview
     view = gtk_text_view_new ();
     gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (view), GTK_WRAP_WORD_CHAR);
     buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
     gtk_text_buffer_set_text (buffer, default_input, -1);
-    gtk_container_add (GTK_CONTAINER (content_area), view);
-
+    gtk_box_pack_start(GTK_BOX(content_area), view, TRUE, TRUE, 0);
+    
     // run the dialog
     gtk_widget_show_all (dialog);
     result = gtk_dialog_run (GTK_DIALOG (dialog));
@@ -443,11 +443,10 @@ gnc_info2_dialog (GtkWidget *parent, const gchar *title, const gchar *msg)
 
     // add a scroll area
     scrolledwindow = gtk_scrolled_window_new (NULL, NULL);
-    gtk_container_add (GTK_CONTAINER (content_area), scrolledwindow);
+    gtk_box_pack_start(GTK_BOX(content_area), scrolledwindow, TRUE, TRUE, 0);
 
     // add a textview
     view = gtk_text_view_new ();
-//    gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (view), GTK_WRAP_WORD_CHAR);
     gtk_text_view_set_editable (GTK_TEXT_VIEW (view), FALSE);
     buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
     gtk_text_buffer_set_text (buffer, msg, -1);