Subtask Support Implementation

[plaintool]

Requested by: Jean Jacques (JJK)

Requirements

1. File Load & Indentation Parsing

   • Calculate task nesting level based on leading spaces in the file.
   • Use 2 spaces = 1 level of nesting.
   • Only leading spaces at the beginning of a task line determine the level.

2. Task Rendering

   • Display tasks in the task text field with indentation according to their level.
   • Leading spaces should be removed when rendering.

3. Collapse/Expand Functionality

   • Add buttons to collapse/expand task levels.
   • Collapsed tasks should be hidden from the view.

4. File Save

   • When saving, convert task levels back into 2-space indentation per level.

5. Task Movement

   • Moving nested tasks up/down is allowed only within the same level, moving all subtasks together.
   • Moving tasks to another group is allowed only for root-level tasks.

Notes

• This feature enhances task hierarchy management and visibility.
• Must maintain full compatibility with existing file format and task operations.