Do not use runReadOnly during TypeHierarchyViewPart.updateViewers #1408 #1410
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partial revert of fc6a25a
The used firePostSelectionChanged may run events that try to edit java model.
fixes #1408
Since "Increase JavaModelCache #1929" its not a performance impact anymore anyway, since the jdt.core typically keeps a cached JavaModel of the TypeHierarchy after computing it anyway and does not need to compute it in ui again.