@keindev - The goal of my suggestion was to work within the constraint that you're describing.

Using my previous examples, it would function something like the following (note that console output is only ever removed from the active console area).

For example, say there are 4 tasks, then the initial display would include all of the tasks

┌─── terminal window (left side)
│ ⠴ Task 1                                           // added
│ ◽️ Task 2                                          // added
│ ◽️ Task 3                                          // added
│ ◽️ Task 4                                          // added
│
│
│
└────────────────────────────────── (end of active console area)

Then there's some output from the first task, so Listr2 could (a) clear the terminal, (b) add a starting bookmark for the first task (that will remain), (c) output whatever has been sent from the first task, (d) add the remaining portion of the listr, so the end result would be something like this.

(a) clear the terminal

┌─── terminal window (left side)
│                                                     // cleared
│                                                     // cleared
│                                                     // cleared
│                                                     // cleared
│
│
│
└────────────────────────────────── (end of active console area)

(b) add a starting bookmark for the first task (that will remain)

┌─── terminal window (left side)
│ > Started: Task 1                                     // added
│
│
│
│
│
│
└────────────────────────────────── (end of active console area)

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task                       // added
│ more output from the first task                       // added
│ and still more output from the first task             // added
│
│
│
└────────────────────────────────── (end of active console area)

(d) add the remaining portion of the listr, so the end result would be something like this.

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task
│ more output from the first task
│ and still more output from the first task
│ ⠴ Task 1                                              // added
│ ◽️Task 2                                               // added
│ ◽️Task 3                                               // added
│ ◽️Task 4                                               // added
└────────────────────────────────── (end of active console area)

From that point one, while there's output from first task, Listr2 could (a) clear its running "final" display, (b) output whatever has been sent from the first task, (c) and add the remaining portion of the listr

(a) clear its running "final" display

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task
│ more output from the first task
│ and still more output from the first task
│                                                     // cleared
│                                                     // cleared
│                                                     // cleared
│                                                     // cleared
└────────────────────────────────── (end of active console area)

(b) output whatever has been sent from the first task

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task
│ more output from the first task
│ and still more output from the first task
│ subsequent first task output                          // added
│ and still more subsequent first task output           // added
│
│
└────────────────────────────────── (end of active console area)

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task
├────────────────────────────────── (beginning of active console area)
│ more output from the first task
│ and still more output from the first task
│ subsequent first task output
│ and still more subsequent first task output
│ ⠴ Task 1                                              // added
│ ◽️ Task 2                                              // added
│ ◽️ Task 3                                              // added
│ ◽️ Task 4                                              // added
└────────────────────────────────── (end of active console area)

Once there's a final status from the first task, Listr2 could (a) clear it's running "final" display, (b) output whatever has been sent from the first task, (c) output the ending bookmark for the task, and (d) add the remaining portion of the listr

(a) clear its running "final" display

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task
├────────────────────────────────── (beginning of active console area)
│ more output from the first task
│ and still more output from the first task
│ subsequent first task output
│ and still more subsequent first task output
│                                                     // cleared
│                                                     // cleared
│                                                     // cleared
│                                                     // cleared
└────────────────────────────────── (end of active console area)

(b) output whatever has been sent from the first task

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task
├────────────────────────────────── (beginning of active console area)
│ more output from the first task
│ and still more output from the first task
│ subsequent first task output
│ and still more subsequent first task output
│ final output from the first task                      // added
│ 
│ 
│ 
└────────────────────────────────── (end of active console area)

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task
├────────────────────────────────── (beginning of active console area)
│ more output from the first task
│ and still more output from the first task
│ subsequent first task output
│ and still more subsequent first task output
│ final output from the first task
│ ✔︎ Completed: Task 1                                   // added
│ 
│ 
└────────────────────────────────── (end of active console area)

(d) add the remaining portion of the listr

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task
│ more output from the first task
├────────────────────────────────── (beginning of active console area)
│ and still more output from the first task
│ subsequent first task output
│ and still more subsequent first task output
│ final output from the first task
│ ✔︎ Completed: Task 1                                   // added
│ ⠴ Task 2                                              // added
│ ◽️ Task 3                                              // added
│ ◽️ Task 4                                              // added
└────────────────────────────────── (end of active console area)

With all the remaining tasks that have their own output, the process would be similar (a) clear out the running "final" display, (b) if it's the first output from the task, output a started bookmark, (c) output whatever has been sent from the task, (d) if it's the final output from the task, output a completed bookmark, and (e) add the remaining portion of the listr

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task
│ more output from the first task
│ and still more output from the first task
│ subsequent first task output
│ and still more subsequent first task output
│ final output from the first task
├────────────────────────────────── (beginning of active console area)
│ ✔︎ Completed: Task 1
│ > Started: Task 2
│ task 2 output
│ more task 2 output
│ final task 2 output
│ ✔︎ Completed: Task 2
│ ⠴ Task 3
│ ◽️ Task 4
└────────────────────────────────── (end of active console area)

For any task that doesn't have output, then treat that task like normal

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task
│ more output from the first task
│ and still more output from the first task
│ subsequent first task output
│ and still more subsequent first task output
│ final output from the first task
├────────────────────────────────── (beginning of active console area)
│ ✔︎ Completed: Task 1
│ > Started: Task 2
│ task 2 output
│ more task 2 output
│ final task 2 output
│ ✔︎ Completed: Task 2
│ ✔︎ Task 3                                           // replaced
│ ⠴ Task 4
└────────────────────────────────── (end of active console area)

Once all the tasks have been completed (successful or not), display the complete list with statuses

┌─── terminal window (left side)
│ > Started: Task 1
│ some output from the first task
│ more output from the first task
│ and still more output from the first task
│ subsequent first task output
│ and still more subsequent first task output
│ final output from the first task
│ ✔︎ Completed: Task 1
│ > Started: Task 2
│ task 2 output
│ more task 2 output
│ final task 2 output
│ ✔︎ Completed: Task 2
│ ✔︎ Task 3
│ > Started: Task 4
├────────────────────────────────── (beginning of active console area)
│ task 4 output
│ final task 4 output
│ ✔︎ Completed: Task 4
│  
│ ✔︎ Task 1
│ ✔︎ Task 2
│ ✔︎ Task 3
│ ✔︎ Task 4
└────────────────────────────────── (end of active console area)

It doesn't address a window size change, but I think it could solve aspects of the duplication problem.
Or am I missing something?

Uh oh!

Listr2 breaks if number of tasks overflow the terminal height #296

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