[fpc-pascal] Directory Tree

[Jean SUZINEAU]

Indeed, I think it's difficult (if possible) to change the behaviour of 
the multiselection this way.

The TTreeview.MultiSelectStyle property allows you to change from 
CtrL+Click to Shift+Click.

https://lazarus-ccr.sourceforge.io/docs/lcl/comctrls/tmultiselectstyle.html

To make the multi selection with just a left click, I think the best way 
would be to use the TVirtualTreeView with checkboxes.