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This is not a bug. You have 2 weird things in your code.
This is the code that is responsible for selecting the units in the background of the live editor :
func select_units(cells: Array) -> void:
selected_units.clear()
for cell in cells:
if cell in units:
selected_units.append(cell)
update()
You did not need to know this to actually complete the exercise but its better to show you.
What your code does is to call the func 4 times with 4 different arrays instead of doing it only once. Your code would have worked if the code above would not have had selected_units.clear() but this is beyond the purpose of this explanation.
Instead of this try calling it in a proper manner something like : select_units([Vector2(x, y), Vector2(x, y), Vector2(x, y), Vector2(x, y)]).
Second thing you understood wrong is that you're trying to call select units with an array containing simple numbers as each index instead of a Vector2 which holds coordinates. Please revisit some of the chapters prior to Lesson 18 for a better understanding.
Describe the bug
A clear and concise description of what the bug is.
To Reproduce
Steps to reproduce the bug:
func run():
select_units([1,0])
select_units([5,1])
select_units([4,2])
select_units([0,3])
error: Unit in cell (1,0) not selected
Expected behavior
Since it seems to identify the other cells as selected, it should see that as selected too
Screenshots
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