Not a regression (was broken in 2.78-), but looks safe enough for 2.79
Before and After:
Run this script in Blender to test the patch:
import bpy
class TestPie(bpy.types.Menu):
bl_label = "Test Pie"
def draw(self, context):
layout = self.layout.menu_pie()
layout.separator()
layout.separator()
layout.separator()
col = layout.box().column(True)
col.row(True).operator("ed.redo")
col.row(True).operator("ed.redo", "1")
bpy.utils.register_class(TestPie)
bpy.ops.wm.call_menu_pie(name="TestPie")