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Using Eclipse 4.4.M3 on Ubuntu Linux. I open MPC wizard, type a search query, find an interesting entry and then click on "more info". It shows me a popul with the full description. When I try to go to click on "Learn more", the pop-up close. So I can't click.
It looks like SWT under Linux/GTK is firing a wrong MOUSE_EXIT event for the tooltip's shell as soon as the mouse enters the tooltip. I still have to check if this is caused by how we set up our widget or is a bug in SWT or the JFace Tooltip and file bugs accordingly. In the meantime, I've worked around this in MPC by opening the tooltip directly under the mouse cursor on Linux, see http://git.eclipse.org/c/mpc/org.eclipse.epp.mpc.git/commit/?id=615a1aa0174e12e304d3f564a687de3a24c082b1. The fix will be in for Luna RC1.
Resolving as fixed in RC1.
Cleanup: closing all released fixes.