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There is no way to set the singleton property on a plugin through the UI. This property is required and without it being there its not obvious that the behavior is available. it would be helpful if it were there then more people would ask what it is for and find out ahead of time how to avoid certain dependency issues.
A checkbox in the Overview section of the manifest editor that toggles the singleton directive in the Bundle-SymbolicName would be nice.
As I have been looking for this feature in the past, it will be a joy for me to fix this bug. Please assign to me.
It will bring the PDE team great joy too! :D
Created attachment 74485 [details] Singleton love for the PDE Manifest editor Enjoy!
Excellent work, I made a few minor changes to the patch in regards to wording and copyright.
Created attachment 74521 [details] org.eclipse.pde.ui.patch
Created attachment 74522 [details] mylyn/context/zip
Released to HEAD. Thanks Peter.