Mouse right click in script editor or console loses current selection

[M. Gronle]

Solution:

• if the right click is within a selection, keep the selection
• if the right mouse click is out of a selection, move the cursor to the closest position of the right mouse click

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[M. Gronle]

fixes issue #113 (mouse right click in script editor or console loses current selection)

→ <<cset f2a6802c23e0>>