cursorPosition()

TwScript:   TW.target.cursorPosition();

This appears in revision 1019, and I have not had an executable to try it out on yet.

From Stefan Löffler's comments on http://code.google.com/p/texworks/source/detail?r=1019

... Works like TW.target.selectionStart.

If there is no selection, returns the same

value as TW.taget.selectionStart.

Otherwise, typically returns either

TW.target.selectionStart or (TW.target.selectionStart + TW.target.selectionEnd),

depending on where the cursor is positioned.

TW.target.selectionStart + TW.target.selectionLength is probably meant.

Read only.

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