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The property marking proposal has been implemented. The form editor can take advantage of it -- it should because there are ways that user's values can become invalid. The idea behind the feature is that if some property value becomes invalid, don't set it to null or some default. Instead, leave what the user set up there and allow the user to fix the problem. The property marking feature lets the module mark these bad values so that the user is alerted to the need to fix them. http://www.netbeans.org/issues/show_bug.cgi?id=12722 One place that the component inspector could use this is when an icon is not found. See bug: http://openide.netbeans.org/issues/show_bug.cgi?id=3431 There are probably many other places it could be used as well.
*** Issue 16992 has been marked as a duplicate of this issue. ***
Target milestone -> 3.3.1.
Set target milestone to TBD
I'd say this was implemented already time ago.
Forgot to change to fixed.
I just tried with NB 4.1 FCS. The disabled icon and disabled selected icon show a red x - but they are null, not an error. If I set the icon and then delete the file and restart the IDE, the icon property does not show the red x and the text shows File:/... So, I think there is still a problem here.