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The reason for this is that the drop-down viewer does not receive the focus after user clicks on the item in the breadcrumb. I'm not 100% why it is designed this way, since I copied the behavior from JDT, but I believe that this is intended to allow for better keyboard navigation of the breadcrumb items themselves. A good compromise may be to give the drop down focus after the pointer enters its area.
Created attachment 130506 [details] Patch with a potential fix. This patch implements switching focus to the drop-down when user mouses over the drop-down shell. I'm hoping to get some input from the JDT editor team about the breadcrumb about it though.
*** This bug has been marked as a duplicate of bug 75766 ***