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There are a lot of components for a JFrame. Selecting about 10 or thirty of them in the inspection window to modify a common property takes extremely long time. You could think there is a loop.
Created attachment 15858 [details] Stacktrace during "loop"
The problematic stack trace from the thread dump doesn't contain methods from form module. The thread dump is almost the same as in the issue 43084 => marking as duplicate of this issue. *** This issue has been marked as a duplicate of 43084 ***