Practice exercise, code editor: second indentation added

[duianto]

Describe the bug

An extra indentation is added in the practice exercise, code editor. When the expressions, but not the first indentation, are removed under a function header.

To Reproduce

Steps to reproduce the bug:

1. Go to the first practice exercise in lesson 9: https://gdquest.github.io/learn-gdscript/#course/lesson-9-adding-and-subtracting/practice-nk1K416Q.tres
2. Click at the end of the second line to place the cursor (shown as a vertical bar | below) after the word pass

   func take_damage(amount):
   pass|

3. Press ctrl backspace to erase the word to the left.

Expected behavior

Only the text pass should be removed, without adding a second indentation.

func take_damage(amount):
    |

Observed

A second indentation was added.

func take_damage(amount):
        |

Information about your device (please complete the following information):

• Operating System: Windows 21H1
• Browser: Microsoft Edge | 97.0.1072.69 (Official build) (64-bit)

Additional context

The issue can be repeated by:

• modifying the first line, for example by:
  • adding and removing a character or a space,
  • or by making a modification and undoing it ctrl z
• or by reloading the whole page by pressing the browsers refresh button.

But the issue can't be reproduced after:

• pressing the Reset button (below the code editor).
• or after pressing ctrl z to undo any modification on the second line.
• or by retyping the second line (one indentation and the text pass)

As demonstrated below, this issue isn't limited to pressing ctrl backspace.

The same thing happens when selecting the expressions, after the second line's indentation, to the end of the code editor's last line. And pressing backspace or delete. (see the examples below)

The issue isn't limited to the practice exercise in lesson 9. It probably happens in all exercises that use the code editor.

For example, in the first lesson: https://gdquest.github.io/learn-gdscript/#course/lesson-1-what-code-is-like/practice-55916.tres

func _ready() -> void:
    print("Welcome!")

Select: print("Welcome!") Press: backspace or delete The selected text was replaced with an extra indentation:

func _ready() -> void:
        |

It also happens in lesson 6, which has multiple lines in the function. https://gdquest.github.io/learn-gdscript/#course/lesson-6-multiple-function-parameters/practice-qAYVjotx.tres

func draw_corner():
    move_forward()
    turn_right(90)
    move_forward()

Select from the second line, after the first indentation, to the end of the last line:

• selection start = [
• selection end = ]

  func draw_corner():
  [move_forward()
  turn_right(90)
  move_forward()]

  Press backspace The selected text was replaced with an extra indentation.

  func draw_corner():
      |

Another example is to just leave a single indentation on the second line:

func draw_corner():
    |

• move up the cursor to the first line
• modify it and undo, for example, erase the space and add it back
• move down the cursor to the second line, after the indentation
• press backspace
• nothing happens
• press backspace again
• now the indentation is removed

  func draw_corner():
  |

[NathanLovato]

I think I know why this happens, I'll fix this a bit later