{"action":"opened","issue":{"url":"https://api.github.com/repos/angular-ui/ui-grid/issues/5422","repository_url":"https://api.github.com/repos/angular-ui/ui-grid","labels_url":"https://api.github.com/repos/angular-ui/ui-grid/issues/5422/labels{/name}","comments_url":"https://api.github.com/repos/angular-ui/ui-grid/issues/5422/comments","events_url":"https://api.github.com/repos/angular-ui/ui-grid/issues/5422/events","html_url":"https://github.com/angular-ui/ui-grid/issues/5422","id":155932083,"number":5422,"title":"Rows not displayed when group row height less than row height.","user":{"login":"mcampster","id":6180356,"avatar_url":"https://avatars.githubusercontent.com/u/6180356?v=3","gravatar_id":"","url":"https://api.github.com/users/mcampster","html_url":"https://github.com/mcampster","followers_url":"https://api.github.com/users/mcampster/followers","following_url":"https://api.github.com/users/mcampster/following{/other_user}","gists_url":"https://api.github.com/users/mcampster/gists{/gist_id}","starred_url":"https://api.github.com/users/mcampster/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mcampster/subscriptions","organizations_url":"https://api.github.com/users/mcampster/orgs","repos_url":"https://api.github.com/users/mcampster/repos","events_url":"https://api.github.com/users/mcampster/events{/privacy}","received_events_url":"https://api.github.com/users/mcampster/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-05-20T10:21:53Z","updated_at":"2016-05-20T10:21:53Z","closed_at":null,"body":"When the grouped row height is smaller than the row height, the visualization prevents the correct number of rows displaying on the grid.\r\n\r\n- grouping enabled  \r\n- row height of 80px. \r\n- group row have a row height of 40px\r\n- the data is such that there there are more collapsed groups than can fit in the vertical viewport.\r\n\r\nYou can solve the problem by increasing the excessRows to a large number e.g. 50. But the performance of the grid takes a huge hit.\r\n\r\nMy guess is the virtualization calculation uses the row height to calculate how many rows can be rendered in the view port. So for a 800px high view port, 10 rows could be rendered. But if the groups are collapsed, you need to render 20 rows to fill the available height. This is a hunch, and I have not managed to track down the source of the problem. "}}
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