{"action":"opened","number":12942,"pull_request":{"url":"https://api.github.com/repos/mantidproject/mantid/pulls/12942","id":38579795,"html_url":"https://github.com/mantidproject/mantid/pull/12942","diff_url":"https://github.com/mantidproject/mantid/pull/12942.diff","patch_url":"https://github.com/mantidproject/mantid/pull/12942.patch","issue_url":"https://api.github.com/repos/mantidproject/mantid/issues/12942","number":12942,"state":"open","locked":false,"title":"BinaryOperateMasks POWGEN bug","user":{"login":"peterfpeterson","id":404003,"avatar_url":"https://avatars.githubusercontent.com/u/404003?v=3","gravatar_id":"","url":"https://api.github.com/users/peterfpeterson","html_url":"https://github.com/peterfpeterson","followers_url":"https://api.github.com/users/peterfpeterson/followers","following_url":"https://api.github.com/users/peterfpeterson/following{/other_user}","gists_url":"https://api.github.com/users/peterfpeterson/gists{/gist_id}","starred_url":"https://api.github.com/users/peterfpeterson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/peterfpeterson/subscriptions","organizations_url":"https://api.github.com/users/peterfpeterson/orgs","repos_url":"https://api.github.com/users/peterfpeterson/repos","events_url":"https://api.github.com/users/peterfpeterson/events{/privacy}","received_events_url":"https://api.github.com/users/peterfpeterson/received_events","type":"User","site_admin":false},"body":"By using constructing the `MaskWorkspace` differently, the visual artifacts are gone. I think the original bug was just in the representation rather than just the data. This does not need to be in the release notes.\r\n\r\n**To test:** There is a script and a file file below to use to see that things are indeed working. Look at the various `MaskWorkspace`s to see that things look how you expect.\r\n\r\n```python\r\nLoadCalFile(InstrumentName=\"POWGEN\",\r\n            CalFilename=\"/SNS/PG3/IPTS-2767/shared/2015_1_11A_CAL/PG3_AGES_d22504_2015_02_25.cal\",\r\n            MakeGroupingWorkspace=False, MakeOffsetsWorkspace=False,\r\n            MakeMaskWorkspace=True, WorkspaceName=\"PG3\")\r\nLoadMask(Instrument=\"POWGEN\", InputFile=\"/location/of/powgen_mask.xml\",\r\n         OutputWorkspace=\"PG3_xml\")\r\nBinaryOperateMasks(InputWorkspace1=\"PG3_mask\", OperationType=\"NOT\",\r\n                   OutputWorkspace=\"NOT\")\r\nBinaryOperateMasks(InputWorkspace1=\"PG3_mask\", InputWorkspace2=\"PG3_xml\",\r\n                   OperationType=\"AND\", OutputWorkspace=\"AND\")\r\nBinaryOperateMasks(InputWorkspace1=\"PG3_mask\", InputWorkspace2=\"PG3_xml\",\r\n                   OperationType=\"OR\", OutputWorkspace=\"OR\")\r\nBinaryOperateMasks(InputWorkspace1=\"PG3_mask\", InputWorkspace2=\"PG3_xml\",\r\n                   OperationType=\"XOR\", OutputWorkspace=\"XOR\")\r\n```\r\n\r\nfilename: powgen_mask.xml\r\n```xml\r\n<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\r\n<detector-masking>\r\n <group>\r\n   <component>Group3</component>\r\n </group>\r\n</detector-masking>\r\n```\r\n","created_at":"2015-06-25T18:46:53Z","updated_at":"2015-06-25T18:46:53Z","closed_at":null,"merged_at":null,"merge_commit_sha":null,"assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/mantidproject/mantid/pulls/12942/commits","review_comments_url":"https://api.github.com/repos/mantidproject/mantid/pulls/12942/comments","review_comment_url":"https://api.github.com/repos/mantidproject/mantid/pulls/comments{/number}","comments_url":"https://api.github.com/repos/mantidproject/mantid/issues/12942/comments","statuses_url":"https://api.github.com/repos/mantidproject/mantid/statuses/99a910f6d603eee0695f8fe1cb5ed2ad15efdda4","head":{"label":"mantidproject:BinaryOperateMasks_bugfix","ref":"BinaryOperateMasks_bugfix","sha":"99a910f6d603eee0695f8fe1cb5ed2ad15efdda4","user":{"login":"mantidproject","id":671496,"avatar_url":"https://avatars.githubusercontent.com/u/671496?v=3","gravatar_id":"","url":"https://api.github.com/users/mantidproject","html_url":"https://github.com/mantidproject","followers_url":"https://api.github.com/users/mantidproject/followers","following_url":"https://api.github.com/users/mantidproject/following{/other_user}","gists_url":"https://api.github.com/users/mantidproject/gists{/gist_id}","starred_url":"https://api.github.com/users/mantidproject/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mantidproject/subscriptions","organizations_url":"https://api.github.com/users/mantidproject/orgs","repos_url":"https://api.github.com/users/mantidproject/repos","events_url":"https://api.github.com/users/mantidproject/events{/privacy}","received_events_url":"https://api.github.com/users/mantidproject/received_events","type":"Organization","site_admin":false},"repo":{"id":2594116,"name":"mantid","full_name":"mantidproject/mantid","owner":{"login":"mantidproject","id":671496,"avatar_url":"https://avatars.githubusercontent.com/u/671496?v=3","gravatar_id":"","url":"https://api.github.com/users/mantidproject","html_url":"https://github.com/mantidproject","followers_url":"https://api.github.com/users/mantidproject/followers","following_url":"https://api.github.com/users/mantidproject/following{/other_user}","gists_url":"https://api.github.com/users/mantidproject/gists{/gist_id}","starred_url":"https://api.github.com/users/mantidproject/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mantidproject/subscriptions","organizations_url":"https://api.github.com/users/mantidproject/orgs","repos_url":"https://api.github.com/users/mantidproject/repos","events_url":"https://api.github.com/users/mantidproject/events{/privacy}","received_events_url":"https://api.github.com/users/mantidproject/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/mantidproject/mantid","description":"Main 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