I installed the 'outline' plugin to quickly browse text outlines.
(jEdit 4.3pre5, sidekick 0.6.4, outline 1.2)
For most text outline shows nothing at all, just 'Not Parsed'. This is even though the folding indicators in the main text are working just fine. For the one case where I can get it to show a tree, it messes up the folding levels. For every change in the tabbing it always makes a sub-level, ie: a new level further indented to the right no matter what is actually in the text. For example:

• Mainheadline
• indent1
• indent2
• indent2.1
• indent3
• indent4

is shown in the outline sidekick as:

• Mainheadline
• +--indent1
• +--indent2
• +--indent2.1
• +--indent3
• +--indent4

I can use the folding commands in the main text (ie: control-e c and control-e x) and they properly show the indenting.

Does 'outline' not do what I think it does?