[Affected versions]: - Nightly 59.0a1 [Affected Platforms]: - All Windows - All Mac - All Linux [Prerequisites]: - Have the latest try build 59.0a1 from (2018-01-05) installed. - Accessibility tab is enabled and focused. [Steps to reproduce]: 1. Click on one of the items in order to select the line. 2. Manually click and drag data from both "Role" and "Name" columns on another row. 3. Let go of the mouse click and observe what happens next. [Expected result]: - The row from step 1 is deselected. - The entire row from step 2 is selected. [Actual result]: - The row from step 1 is still selected. - Only the text that was manually selected at step 3 is selected. [Notes]: - This is also reproducible on the "Properties" panel"; - Attached is a gif with the issue.

TreeView's rows are only selected when click event happens on a tree row. If it is a long click, nothing happens on mouse up. Not sure if it is expected for the row to be selected on long mouse press after mouse up so marking it as lower priority.