cssstyle: Don't store custom css properties

This makes custom CSS properties no longer configurable. But it avoids
crashes when loading custom themes, so that's a good thing.

Testcase included.

https://bugzilla.redhat.com/show_bug.cgi?id=1281234

gtk/gtkcsslookup.c

@@ -28,9 +28,8 @@ GtkCssLookup *
 _gtk_css_lookup_new (const GtkBitmask *relevant)
 {
   GtkCssLookup *lookup;
-  guint n = _gtk_css_style_property_get_n_properties ();
 
-  lookup = g_malloc0 (sizeof (GtkCssLookup) + sizeof (GtkCssLookupValue) * n);
+  lookup = g_malloc0 (sizeof (GtkCssLookup));
 
   if (relevant)
     {
@@ -39,7 +38,7 @@ _gtk_css_lookup_new (const GtkBitmask *relevant)
   else
     {
       lookup->missing = _gtk_bitmask_new ();
-      lookup->missing = _gtk_bitmask_invert_range (lookup->missing, 0, n);
+      lookup->missing = _gtk_bitmask_invert_range (lookup->missing, 0, GTK_CSS_PROPERTY_N_PROPERTIES);
     }
 
   return lookup;
@@ -109,16 +108,14 @@ _gtk_css_lookup_resolve (GtkCssLookup            *lookup,
                          GtkCssStaticStyle       *style,
                          GtkCssStyle             *parent_style)
 {
-  guint i, n;
+  guint i;
 
   gtk_internal_return_if_fail (lookup != NULL);
   gtk_internal_return_if_fail (GTK_IS_STYLE_PROVIDER_PRIVATE (provider));
   gtk_internal_return_if_fail (GTK_IS_CSS_STATIC_STYLE (style));
   gtk_internal_return_if_fail (parent_style == NULL || GTK_IS_CSS_STYLE (parent_style));
 
-  n = _gtk_css_style_property_get_n_properties ();
-
-  for (i = 0; i < n; i++)
+  for (i = 0; i < GTK_CSS_PROPERTY_N_PROPERTIES; i++)
     {
       if (lookup->values[i].value ||
           _gtk_bitmask_get (lookup->missing, i))

gtk/gtkcsslookupprivate.h

@@ -35,7 +35,7 @@ typedef struct {
 
 struct _GtkCssLookup {
   GtkBitmask        *missing;
-  GtkCssLookupValue  values[1];
+  GtkCssLookupValue  values[GTK_CSS_PROPERTY_N_PROPERTIES];
 };
 
 GtkCssLookup *          _gtk_css_lookup_new                     (const GtkBitmask           *relevant);

gtk/gtkcssstaticstyle.c

@@ -46,11 +46,14 @@ gtk_css_static_style_get_value (GtkCssStyle *style,
 {
   GtkCssStaticStyle *sstyle = GTK_CSS_STATIC_STYLE (style);
 
-  if (sstyle->values == NULL ||
-      id >= sstyle->values->len)
-    return NULL;
+  if (G_UNLIKELY (id >= GTK_CSS_PROPERTY_N_PROPERTIES))
+    {
+      GtkCssStyleProperty *prop = _gtk_css_style_property_lookup_by_id (id);
 
-  return g_ptr_array_index (sstyle->values, id);
+      return _gtk_css_style_property_get_initial_value (prop);
+    }
+
+  return sstyle->values[id];
 }
 
 static GtkCssSection *
@@ -70,11 +73,12 @@ static void
 gtk_css_static_style_dispose (GObject *object)
 {
   GtkCssStaticStyle *style = GTK_CSS_STATIC_STYLE (object);
+  guint i;
 
-  if (style->values)
+  for (i = 0; i < GTK_CSS_PROPERTY_N_PROPERTIES; i++)
     {
-      g_ptr_array_unref (style->values);
-      style->values = NULL;
+      if (style->values[i])
+        _gtk_css_value_unref (style->values[i]);
     }
   if (style->sections)
     {
@@ -115,14 +119,9 @@ gtk_css_static_style_set_value (GtkCssStaticStyle *style,
                                 GtkCssValue       *value,
                                 GtkCssSection     *section)
 {
-  if (style->values == NULL)
-    style->values = g_ptr_array_new_with_free_func ((GDestroyNotify)_gtk_css_value_unref);
-  if (id >= style->values->len)
-   g_ptr_array_set_size (style->values, id + 1);
-
-  if (g_ptr_array_index (style->values, id))
-    _gtk_css_value_unref (g_ptr_array_index (style->values, id));
-  g_ptr_array_index (style->values, id) = _gtk_css_value_ref (value);
+  if (style->values[id])
+    _gtk_css_value_unref (style->values[id]);
+  style->values[id] = _gtk_css_value_ref (value);
 
   if (style->sections && style->sections->len > id && g_ptr_array_index (style->sections, id))
     {
@@ -208,6 +207,7 @@ gtk_css_static_style_compute_value (GtkCssStaticStyle       *style,
   gtk_internal_return_if_fail (GTK_IS_CSS_STATIC_STYLE (style));
   gtk_internal_return_if_fail (GTK_IS_STYLE_PROVIDER_PRIVATE (provider));
   gtk_internal_return_if_fail (parent_style == NULL || GTK_IS_CSS_STYLE (parent_style));
+  gtk_internal_return_if_fail (id < GTK_CSS_PROPERTY_N_PROPERTIES);
 
   /* http://www.w3.org/TR/css3-cascade/#cascade
    * Then, for every element, the value for each property can be found

gtk/gtkcssstaticstyleprivate.h

@@ -39,7 +39,7 @@ struct _GtkCssStaticStyle
 {
   GtkCssStyle parent;
 
-  GPtrArray             *values;               /* the values */
+  GtkCssValue           *values[GTK_CSS_PROPERTY_N_PROPERTIES]; /* the values */
   GPtrArray             *sections;             /* sections the values are defined in */
 
   GtkCssChange           change;               /* change as returned by value lookup */

testsuite/gtk/stylecontext.c

@@ -407,6 +407,29 @@ test_style_classes (void)
   g_object_unref (context);
 }
 
+void
+test_new_css_property (void)
+{
+  GtkWidget *widget;
+  GtkStyleContext *context;
+  GtkBorder padding;
+
+  widget = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_widget_realize (widget);
+  context = gtk_widget_get_style_context (widget);
+
+  gtk_style_context_get_padding (context, gtk_style_context_get_state (context), &padding);
+
+G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
+  gtk_style_properties_register_property (NULL,
+                                          g_param_spec_int ("test", "test", "test",
+                                                            0, G_MAXINT, 42, G_PARAM_READWRITE));
+G_GNUC_END_IGNORE_DEPRECATIONS;
+
+  gtk_style_context_add_class (context, "nonexisting");
+  gtk_style_context_get_padding (context, gtk_style_context_get_state (context), &padding);
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -421,6 +444,7 @@ main (int argc, char *argv[])
   g_test_add_func ("/style/set-widget-path-saved", test_set_widget_path_saved);
   g_test_add_func ("/style/widget-path-parent", test_widget_path_parent);
   g_test_add_func ("/style/classes", test_style_classes);
+  g_test_add_func ("/style/new-css-property", test_new_css_property);
 
   return g_test_run ();
 }