Finish dot grapher v1 about axelements HOT 5 CLOSED

This is just about done, all it needs is the identifying label. Right now, the only identifier is the type of element that it is (button, outline, text field), which doesn't help that much in cases with a lot of similar elements (scroll areas, groups, etc.).

Using the PPInspector#pp_identifier method is often too verbose, so I either need to trim it down or use some other piece of identifying information. @mcowan, what do you think?

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Hmm, at least in the indirection cases for pp_identifier, we can have the graph draw another arrow (with a different body type) instead of adding text to the label.

For long text values (i.e. text boxes), it might just be better to only include the first 10 characters and include ellipsis to indicate that it has been cut off.

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I haven't actually played with it as of yet. Commonly though when you think things need trimmed down you're correct, so go with your gut on that.

Yes please use the ellipsis to trim things down.

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This pretty much works except for handling a few edge cases. Also needs to have a patch from the debug changes branch cherry picked into master.

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Done. Will be pushed later today.

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