fix hide/show hidden files behaviour on MacOS
fix hide/show hidden files behaviour on MacOS

d-tk/dtk,d-tk/dtk,d-tk/dtk,d-tk/dtk,d-tk/dtk,NicolasSchnitzler/dtk,NicolasSchnitzler/dtk,NicolasSchnitzler/dtk,d-tk/dtk,rdebroiz/dtk,rdebroiz/dtk,rdebroiz/dtk,rdebroiz/dtk,NicolasSchnitzler/dtk