Save layouts convenient with custom actions [bash] [thunar]

We will use bash "substring"-variable-expansion on an indexed array to store a range of array elements in a variable, which we need to be able to save rules with custom actions.

https://stackoverflow.com/a/20160875

The video I was watching: Underscore (Goto80 & Fabio Dondero) https://www.youtube.com/watch?v=ha-DX3Pb5gY ... https://www.youtube.com/watch?v=ZqQxMiWfX0M