Ui freeze then crash

reproducing in my local environment all the time since pmd install. I think it was installed after m2e connector installation after importing https://github.com/apache/cxf and https://github.com/apache/velocity-engine/tree/1.7.x

it stays blocked with this stack:

Name: Worker-0: Decoration Calculation
State: RUNNABLE
Total blocked: 92  Total waited: 87

Stack trace: 
org.eclipse.swt.internal.cairo.Cairo.cairo_paint(Native Method)
org.eclipse.swt.internal.ImageList.convertSurface(ImageList.java:59)
org.eclipse.swt.graphics.Image.getImageDataAtCurrentZoom(Image.java:1085)
org.eclipse.swt.graphics.Image.getImageData(Image.java:1169)
org.eclipse.swt.graphics.Image.getImageData(Image.java:1058)
net.sourceforge.pmd.eclipse.ui.ShapePainter.newDrawnImage(ShapePainter.java:44)
net.sourceforge.pmd.eclipse.ui.priority.PriorityDescriptor.createImage(PriorityDescriptor.java:211)
net.sourceforge.pmd.eclipse.ui.priority.PriorityDescriptor.getImage(PriorityDescriptor.java:233)
net.sourceforge.pmd.eclipse.ui.priority.PriorityDescriptor.getAnnotationImage(PriorityDescriptor.java:202)
net.sourceforge.pmd.eclipse.ui.priority.PriorityDescriptor.refreshImages(PriorityDescriptor.java:263)
net.sourceforge.pmd.eclipse.ui.priority.PriorityDescriptorCache.refreshImages(PriorityDescriptorCache.java:94)
net.sourceforge.pmd.eclipse.ui.priority.PriorityDescriptorCache.loadFromPreferences(PriorityDescriptorCache.java:50)
net.sourceforge.pmd.eclipse.ui.priority.PriorityDescriptorCache.<init>(PriorityDescriptorCache.java:28)
net.sourceforge.pmd.eclipse.ui.priority.PriorityDescriptorCache.<clinit>(PriorityDescriptorCache.java:24)
net.sourceforge.pmd.eclipse.ui.RuleLabelDecorator.decorate(RuleLabelDecorator.java:98)
org.eclipse.ui.internal.decorators.LightweightDecoratorDefinition.decorate(LightweightDecoratorDefinition.java:247)
org.eclipse.ui.internal.decorators.LightweightDecoratorManager$LightweightRunnable.run(LightweightDecoratorManager.java:105)
org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
org.eclipse.ui.internal.decorators.LightweightDecoratorManager.decorate(LightweightDecoratorManager.java:360)
org.eclipse.ui.internal.decorators.LightweightDecoratorManager.getDecorations(LightweightDecoratorManager.java:346)
org.eclipse.ui.internal.decorators.DecorationScheduler$1.ensureResultCached(DecorationScheduler.java:386)
org.eclipse.ui.internal.decorators.DecorationScheduler$1.run(DecorationScheduler.java:362)
org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

Fedora 33
Eclipse 2020-12

Reproduce the freeze in the PMD Eclipse plugin after installing PMD and the m2e connector, using the CXF and velocity-engine imports on Fedora 33 with Eclipse 2020-12. Start with net.sourceforge.pmd.eclipse.ui.ShapePainter.newDrawnImage and the PriorityDescriptor image-loading path shown in the stack trace. Done means the decoration calculation no longer remains blocked or crashes in this scenario.