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when walking head dump it is useful to copy value of a String (or its char[]): 1. when you want to pass the information what you have found 2. when the content is truncated I'd say it is a RFE but the latter is so annoying for long strings that it sounds more like a bug to me.
This is really an enhancement, current functionality works as designed. Afaik the char[] contents is truncated just in the tooltip and full contents is still available in Fields view (not easy to use but not a defect).
Milestone cleanup: future->next
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