[gtk/constraint-editor-work: 2/4] constraintlayout: Fix parsing of constant constraints

[Matthias Clasen <matthiasc src gnome org>]

commit 76b8676955ffa1b346c3c367acbb8b9cdc0f7f63
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Nov 17 23:11:16 2020 -0500

    constraintlayout: Fix parsing of constant constraints
    
    We were inadvertently turning constant constraints into
    constraints against super, due to confusion between target
    and source attribute.

 gtk/gtkconstraintlayout.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/gtk/gtkconstraintlayout.c b/gtk/gtkconstraintlayout.c
index e5d6037962..92fbfcc416 100644
--- a/gtk/gtkconstraintlayout.c
+++ b/gtk/gtkconstraintlayout.c
@@ -1431,18 +1431,18 @@ constraint_data_to_constraint (const ConstraintData *data,
   else
     strength = GTK_CONSTRAINT_STRENGTH_REQUIRED;
 
-  if (source != NULL && source_attr != GTK_CONSTRAINT_ATTRIBUTE_NONE)
+  if (source == NULL && source_attr == GTK_CONSTRAINT_ATTRIBUTE_NONE)
+    return gtk_constraint_new_constant (target, target_attr,
+                                        relation,
+                                        data->constant,
+                                        strength);
+  else
     return gtk_constraint_new (target, target_attr,
                                relation,
                                source, source_attr,
                                data->multiplier,
                                data->constant,
                                strength);
-
-  return gtk_constraint_new_constant (target, target_attr,
-                                      relation,
-                                      data->constant,
-                                      strength);
 }
 
 static GtkConstraintGuide *