tests: Add tab_ordering_custom_i32_vs_u32 test

This test verifies the behavior of i32/u32 discrepancy
in tabIndex in AVM1.

tests/tests/swfs/avm1/tab_ordering_custom_i32_vs_u32/input.json

@@ -0,0 +1,7 @@
+[
+  { "type": "KeyDown", "key_code": 9 },
+  { "type": "KeyDown", "key_code": 9 },
+  { "type": "KeyDown", "key_code": 9 },
+  { "type": "KeyDown", "key_code": 9 },
+  { "type": "KeyDown", "key_code": 9 }
+]

tests/tests/swfs/avm1/tab_ordering_custom_i32_vs_u32/output.txt

@@ -0,0 +1,12 @@
+Focus changed
+  old: null
+  new: _level0.text
+Focus changed
+  old: _level0.text
+  new: _level0.text2
+Focus changed
+  old: _level0.text2
+  new: _level0.button
+Focus changed
+  old: _level0.button
+  new: _level0.text

tests/tests/swfs/avm1/tab_ordering_custom_i32_vs_u32/test.as

@@ -0,0 +1,18 @@
+var counter = 0;
+var listener = new Object();
+listener.onSetFocus = function(oldFocus, newFocus) {
+    ++counter;
+    if (counter > 4) {
+        return;
+    }
+    if (newFocus) {
+        trace("Focus changed");
+        trace("  old: " + oldFocus);
+        trace("  new: " + newFocus);
+    }
+};
+Selection.addListener(listener);
+
+text.tabIndex = 4294967293;
+text2.tabIndex = -2;
+button.tabIndex = 0;

tests/tests/swfs/avm1/tab_ordering_custom_i32_vs_u32/test.toml

@@ -0,0 +1 @@
+num_ticks = 1