Editor crash when minimizing with "interface/editor/save_on_focus_loss" set to true

[SleepyTonia]

Godot version

4.1 dev 2

System information

Linux Manjaro

Issue description

If a project has a scene stored and open, when the editor loses focus the following line will flood the terminal:

ERROR: Task 'save' already exists.
at: add_task (editor/progress_dialog.cpp:177)

This only happens following this sequence of events and if the editor setting "interface/editor/save_on_focus_loss" is set to true. Manually saving doesn't cause any issues. Saving just before minimizing doesn't prevent this either.

Steps to reproduce

Create a new project, create a scene of any type and save it. Go in the editor settings and set "Save on focus loss" to true. Then all you need to do is minimize the window.

Minimal reproduction project

focus_loss.zip

[Calinou]

Thanks for the report! Consolidating in #73765.