On Tue, 18 Feb 2020 11:18:26 +0100, "R.Wieser" 
declaimed the following:



>... but while testing that (it works btw) I stumbled over something I did
>not consider: Both the SHIFT as well as the CTRL keys are modifiers when
>selecting (a range of) files.
>

 Common practice in file managers is that  and mouse click will
select everything from "first" (or last depending on sort order) that HAD
BEEN selected up to the item just clicked upon.  "adds" the clicked
item to an ad-hoc selection.

>I found that out when SHIFT-doubleclicking the Python script itself, and
>seeing a number of scripts opened (luckily in texteditors, as I have set
>that as the default action).    The same (ofcourse) happens for shortcuts on
>the desktop.
>

 This likely meant you had a file, somewhere else in the window, that
had been "selected" (highlighted) when you  on the new
file.

 If you first single-click the one file, then hold  and
double-click, it should only process that single file.

>
>Do you perhaps have any ideas ?
>
 No...


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