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Created attachment 91332 [details] Thread Dump 3.3.1 The UI hung when opening the launch configuration dialog while building the workspace in the background. Will attach thread dump.
In this case, it's actually the PDE tabs that decided to update/migrate a launch configuration and initiates the save of the launch configuration working copy. (However, in general the LCD could do a similar thing by "auto-saving" a config that appears dirty when selected). It feels like the LCD needs a mechanism to post these updates such that the standard "blocked operation" progress dilaog could be opened, and the user can see what is going on and potentially terminate one of the operations in conflict.
marking as dup of newer bug that has more details. *** This bug has been marked as a duplicate of bug 230403 ***