[gimp] libgimp: new GtkSizeGroup for widgets inside a container

[Jehan <jehanp src gnome org>]

commit c99ae3769f23b0e99c4ad9b77ec9835c60ae0f05
Author: Mayank Suman <mayanksuman live com>
Date:   Thu Jun 17 23:41:15 2021 +0530

    libgimp: new GtkSizeGroup for widgets inside a container
    
    All the widgets with label inside GimpProcedureDialog have same
    GtkSizeGroup (dialog->priv->label_group), which result in wrong sizes of
    widget if any of the label is long. In this commit, a new GtkSizeGroup
    is made for each of the container, so that labels are aligned but size
    of widget in one container do not affect size of widgets in other
    containers.
    
    For the widget not belonging to any of the container, default
    GtkSizeGroup (dialog->priv->label_group) is used.

 libgimp/gimpproceduredialog.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/libgimp/gimpproceduredialog.c b/libgimp/gimpproceduredialog.c
index de8257f30a..487b48cf96 100644
--- a/libgimp/gimpproceduredialog.c
+++ b/libgimp/gimpproceduredialog.c
@@ -1750,8 +1750,9 @@ gimp_procedure_dialog_fill_container_list (GimpProcedureDialog *dialog,
                                            GtkContainer        *container,
                                            GList               *properties)
 {
-  GList    *iter;
-  gboolean  free_properties = FALSE;
+  GList        *iter;
+  gboolean      free_properties = FALSE;
+  GtkSizeGroup *sz_group;
 
   g_return_val_if_fail (container_id != NULL, NULL);
   g_return_val_if_fail (GTK_IS_CONTAINER (container), NULL);
@@ -1803,6 +1804,7 @@ gimp_procedure_dialog_fill_container_list (GimpProcedureDialog *dialog,
         free_properties = TRUE;
     }
 
+  sz_group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
   for (iter = properties; iter; iter = iter->next)
     {
       GtkWidget *widget;
@@ -1816,6 +1818,12 @@ gimp_procedure_dialog_fill_container_list (GimpProcedureDialog *dialog,
            */
           g_object_ref (widget);
           gtk_container_add (container, widget);
+          if (GIMP_IS_LABELED (widget))
+            {
+              GtkWidget *label = gimp_labeled_get_label (GIMP_LABELED (widget));
+              gtk_size_group_remove_widget (dialog->priv->label_group, label);
+              gtk_size_group_add_widget (sz_group, label);
+            }
           gtk_widget_show (widget);
         }
     }