Add a test for a flowbox crash

testsuite/gtk/flowbox.c

@@ -0,0 +1,59 @@
+#include <gtk/gtk.h>
+
+static gboolean
+main_loop_quit_cb (gpointer data)
+{
+  gboolean *done = data;
+
+  *done = TRUE;
+
+  g_main_context_wakeup (NULL);
+
+  return FALSE;
+}
+
+static void
+show_and_wait (GtkWidget *widget)
+{
+  gboolean done = FALSE;
+
+  g_timeout_add (500, main_loop_quit_cb, &done);
+  gtk_widget_show (widget);
+  while (!done)
+    g_main_context_iteration (NULL, FALSE);
+}
+
+/* this was triggering a crash in gtk_flow_box_measure(),
+ * see #2702
+ */
+static void
+test_measure_crash (void)
+{
+  GtkWidget *window, *box, *child;
+
+  window = gtk_window_new ();
+  box = gtk_flow_box_new ();
+  gtk_widget_set_valign (GTK_WIDGET (box), GTK_ALIGN_START);
+  child = g_object_new (GTK_TYPE_FLOW_BOX_CHILD,
+                        "css-name", "nopadding",
+                        NULL);
+  gtk_flow_box_insert (GTK_FLOW_BOX (box), child, -1);
+  gtk_orientable_set_orientation (GTK_ORIENTABLE (box), GTK_ORIENTATION_VERTICAL);
+  gtk_flow_box_set_row_spacing (GTK_FLOW_BOX (box), 0);
+
+  gtk_window_set_child (GTK_WINDOW (window), box);
+
+  show_and_wait (window);
+
+  gtk_window_destroy (GTK_WINDOW (window));
+}
+
+int
+main (int argc, char *argv[])
+{
+  gtk_test_init (&argc, &argv);
+
+  g_test_add_func ("/flowbox/measure-crash", test_measure_crash);
+
+  return g_test_run ();
+}

testsuite/gtk/meson.build

@@ -29,6 +29,7 @@ tests = [
   ['filterlistmodel'],
   ['flattenlistmodel'],
   ['floating'],
+  ['flowbox'],
   #['gestures'],
   ['grid'],
   ['grid-layout'],