#146 cursor stays in interactive window after dblclick

[bob gailer]

Double-clicking a traceback line (opens and) activates
the module edit window, but the cursor stays in the
interactive window. It would be more useful to have the
cursor appear in the edit window.

[Roger Upole]

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It appears that after the double-click processing
that opens the file and moves the cursor to the
specified line, scintilla unconditionally sets the cursor
back to the location that was clicked. I may try to work
out some way of setting the cursor asynchronously.