[FR] Forecast view: option to show completed tasks by completion date

[kkirss]

When I complete a task, it vanishes from Forecast. I can't see what I accomplished on previous days.

Root cause

getRelevantDate() in forecast.ts ignores completion dates:

const dateToUse = task.metadata.scheduledDate || task.metadata.dueDate;

Suggested fix

Include completedDate for completed tasks:

const dateToUse = (task.completed && task.metadata.completedDate) 
    || task.metadata.scheduledDate 
    || task.metadata.dueDate;

Completed tasks would then appear on their completion date. Incomplete tasks behave as before.

[kkirss]

I think I'm a bit confused on how completed tasks are handled in general. For example in some views I see completed tasks as "overdue" because their scheduled date is in the past. This doesn't make sense. Completed tasks cannot be overdue.