Steps 
step 1: Create this class
public class ClassWithLongMethodNames {

    public void printLongLoongLooooooooooooooooooogName() {
        System.out.println("printLongLoongLooooooooooooooooooogName");

    }

    public void anotherLongLoongLooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooogName() {
        System.out.println("anotherLongLoongLooooooooooooooooooogName");

    }
}

Step 2 : create this class
public class Main  {

    private ClassWithLongMethodNames methodNames;

    public Main(ClassWithLongMethodNames methodNames) {
        this.methodNames = methodNames;
    }

    


}


now try to invoke "Insert Code.." > "Delegate"
Dialog pops up now first select or hover first method you will see incorrect rendering and now try to select other
methods all will going to rendering incorrectly :(

this issue affects all code insert dialog ui 

(I'll attach screen shots) 

Created attachment 64956 [details]
screen shot 1

User case 2 
  1 follow first case first two steps 
  2 now try to invoke "Insert Code.." > "Getter..." or "Setter"
  see screen shot 2
  
   
  

Created attachment 64958 [details]
screen shot 2

Standard explorer views are used in the dialog to my knowledge.

no this is issue is on editor tree views that has customize to show checkboxes I guess that where is lives please
correct me If I'm wrong 

Reproduced - items in the tree view just disappear.

Yes, it appears to be really caused by our (java.editor) renderer. Sorry for confusion.

Happens only for extremely long methods.

*** Issue 141085 has been marked as a duplicate of this issue. ***

regression since 6.1

Maxi, can you take a look at it? Thanks

Fixed. There is still a minor bug concerning tooltips shown on mouseover when node labels are too long, I'll file a new issue about that.
---
http://hg.netbeans.org/main/rev/6941659af004

Integrated into 'main-golden', available in build *200807310201* on http://bits.netbeans.org/dev/nightly/
Changeset: http://hg.netbeans.org/main/rev/6941659af004
User: Max Sauer <msauer@netbeans.org>
Log: #140740: [65cat] [editor]Many render issue on insert code dialog tree views