[reesd]

Originally posted by quant
Can you give an example or explain when having a filtered tree is a necessity for the problem at hand, so that I can better understand its usefulness?

I'll try and and give a quick example.
You want a tree when things have a parent/child relationship. You want to filter when you just want to narrow down what you are looking at while still keeping that relationship.

Here is a simple example of a backpacking list (it seems simpler to than a todo list which is my main use case). The tree is used to group similar items or group them by where they are packed. I have a people column that indicates if an item is used when I am going solo (lighweight being important) or with a group (need to support group and can share load with them). So I can quickly filter the list to just the stuff I will need.

backpacking list         people
  sacks
    big backpack         group
    small backpack       solo
  cooking
    stove
    utensils
    small pans           solo
    big pans             group

My actual backpacking list is much longer than this and has 4-5 aspects that I use to filter including weight, people, number of days, etc. Tree filtering is key to keeping the structure but also being able to ignore/see the right items.

d