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When an EditorPart's createPartControl(Composite parent) method is invoked, calling isVisible() on the parent returns false most of the time (to prevent flashing perhaps?). However, there are certain times when it is visible. This is the case where you have three editors open, and you close the workbench. Upon restarting, if you close the first two editors that are visible, the third one (and all remaining editors, if more were open) will be given a visible Composite in its createPartControl() method. If you only have two editors open when the workbench restarts, whether or not the second one will get a visible Composite depends on which is initially selected.
As per http://wiki.eclipse.org/Platform_UI/Bug_Triage_Change_2009
Remy is now responsible for watching the [EditorMgmt] component area.
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.
