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Created attachment 247550 [details] screenshot showing outline of transparent javadoc information When I moused over the method name in a reference to the Thread.sleep() method, a box appeared for the javadoc of the method. But the box was empty. All I could see was a transparent box with visible edges. The box was more than an inch high, so it seems that it thought that there was content to draw, but nothing appeared. See screen shot. Running 4.4.0. Nothing appears in the workspace/.metadata/.log file when the problem occurs.
I've also seen this shadow hover on Windows, but very infrequently, and I could never reproduce. My closest guess is that it has something to do with debugging scenarios where a breakpoint stopped the UI thread, and then the OS gets confused about the window Z-order. The shadow is drawn by the OS, so your screenshot should actually not be possible (but I know it really happens!). Please update this bug if you have more information about circumstances that could trigger the problem. A workaround is to close and reopen the editor (e.g. via the Back button).
Bug 177355 in SWT is about the same issue.
FYI, I saw this behavior in another app. I was using LibreOffice Calc and was trying to sort a spreadsheet. When I tried to set the primary sort column, the list of available columns showed up in an empty, transparent box. Do not know what that is worth, but there it is.
This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. If you have further information on the current state of the bug, please add it. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant. -- The automated Eclipse Genie.
