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Add support for: * tooltipExpression * hoverImageExpression * sub-actions
The tooltipExpression is already handled by https://bugs.eclipse.org/bugs/show_bug.cgi?id=496076
The hoverImageExpression can't be handled correctly. Indeed, with the default implementation of org.eclipse.jface.action.ActionContributionItem, the private method boolean updateImage(boolean forceImage) if the hoverImageDescriptor is set, then it is taken as the image in place of the imageDescriptor. See boolean org.eclipse.jface.action.ActionContributionItem.updateImages(boolean forceImage) fore more details.
New Gerrit change created: https://git.eclipse.org/r/88617
New Gerrit change created: https://git.eclipse.org/r/88618
Moving to 5.1 as this is not essential for 5.0. If this is fixed for 5.0, fine, but it's not blocking for 5.0.