fix #1246 the easy way

BizHawk.Client.EmuHawk/movie/PlayMovie.cs

@@ -479,7 +479,13 @@ private void MovieView_SelectedIndexChanged(object sender, EventArgs e)
 						}
 						break;
 					case HeaderKeys.PLATFORM:
-						if (kvp.Value != Global.Game.System)
+						// feos: previously it was compared against Global.Game.System, but when the movie is created
+						// its platform is copied from Global.Emulator.SystemId, see PopulateWithDefaultHeaderValues()
+						// the problem is that for GameGear and SG100, those mismatch, resulting in false positive here
+						// I have a patch to make GG and SG appear as platforms in movie header (issue #1246)
+						// but even with it, for all the old movies, this false positive would have to be worked around anyway
+						// TODO: actually check header flags like "IsGGMode" and "IsSegaCDMode" (those are never parsed by bizhawk)
+						if (kvp.Value != Global.Emulator.SystemId)
 						{
 							item.BackColor = Color.Pink;
 						}