TimelineDataGrid._refreshDirtyDataGridNodes can trigger exceptions in DataGrid.removeChild and TreeOutline.removeChild if it is run while a filter is applied. We should just convert these exceptions to early returns. These exceptions break the UI hard, where things won't be added anymore to the DataGrid.
<rdar://problem/21674514>
Created attachment 256147 [details] Patch
Comment on attachment 256147 [details] Patch r=me
Comment on attachment 256147 [details] Patch Clearing flags on attachment: 256147 Committed r186306: <http://trac.webkit.org/changeset/186306>
All reviewed patches have been landed. Closing bug.