[PluginDirectory] - ensure that Abort of ScriptObserver waits for thread exit - fix crash&burn #15204
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This prevents bad access of already destroyed event object during a race condition.
Once of the Mac OS users was hit by that crash in a really reproducible manner. He also confirmed the fix.
Thx to @FernetMenta for the finding of the root cause.
This crash hits all platforms and might have happened whenever a plugin listing is opened or a movie is played via the plugin:// uri scheme