Is there a way to show non truncated data with tshark without recompiling?

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That request is talking about the items in the packet detail pane. It's not clear that, say, a line in a protocol tree view that's 100000 characters wide would be all that useful - that's a lot of scrolling* - but for somebody dumping that information out in a form possibly intended for machine consumption, such as -T fields output, perhaps there should be no limit.

That might require that the -T fields output be produced by different code from the protocol tree display code, but that's not necessarily a bad thing - what's useful for human consumption isn't necessarily what's useful for machine consumption.