The MarkerSets plugin is a replacement for the built-in Markers feature of jEdit. Markers saved with MarkerSets properly update when lines are added or removed from a buffer. Furthermore, you can see markers from multiple files in the Marker Sets dockable. We recommend you use that instead of the built-in Markers.
A marker is a pointer to a specific
        location within a buffer, which may or may not have a single-character
        shortcut associated with it. Markers are
        persistent; they are saved to
        ., where
        filename.marksfilename
> (shortcut: C+e C+m) adds a marker
        without a shortcut pointing to the current line. If a marker is already
        set on the current line, the marker is removed instead. If text is
        selected, markers are added to the first and last line of each
        selection.
Markers are listed in the menu; selecting a marker from this menu will move the caret to its location.
> (shortcut: C+e C+COMMA) goes to
        the marker immediately before the caret position.
> (shortcut: C+e C+PERIOD) goes to
        the marker immediately after the caret position.
> removes all markers set in the current buffer.
Markers with shortcuts allow for quicker keyboard-based
        navigation. The following commands all prompt for a single-character
        shortcut when invoked. Pressing ESCAPE instead of
        specifying a shortcut will cancel the operation.
> (shortcut: C+t
        ) adds a marker with the
        specified shortcut. If marker with that shortcut already exists, it will
        remain in the buffer but lose its shortcut.key
> (shortcut: C+y
        ) moves the caret to the location
        of the marker with the specified shortcut.key
> (shortcut: C+u
        ) creates a selection from the
        caret location to the marker with the specified shortcut.key
> (shortcut: C+k
        ) moves the caret to the location
        of the marker with the specified shortcut, and moves the marker to the
        former caret position. Invoke this command multiple times to flip
        between two locations in the buffer.key
Lines which contain markers are indicated in the gutter with a highlight. Moving the mouse over the highlight displays a tool tip showing the marker's shortcut, if it has one. See the section called “Interface Overview” for information about the gutter.