[BUG] Incorrect highlighting for YAML multiline string (block scalars)

[theonlypwner]

Is there an existing issue for this?

• I have searched the existing issues

Description of the Issue

This YAML example is highlighted incorrectly in Notepad++ but works in VS Code:

a: |
    this is the first line in the string

    # this is not a comment
    b: false
    c: 0
    fail: this is the last line
otherProperty: this is correctly highlighted

That example corresponds to this JSON (which can be confirmed by copying the example to https://yaml-online-parser.appspot.com):

{
  "a": "this is the first line in the string\n\n# this is not a comment\nb: false\nc: 0\nfail: this is the last line\n", 
  "otherProperty": "this is correctly highlighted"
}

VS Code correctly highlights it.

Notepad++ fails to highlight it correctly.

At the time of posting, GitHub also has the same issue!

Steps To Reproduce

1. Copy the example to Notepad++.
2. Set the language to YAML.
3. Look at the incorrect highlighting.

Current Behavior

The highlighting is incorrect.

Expected Behavior

The highlighting is correct, as shown in the VS Code example screenshot.

Debug Information

Notepad++ v8.6.7   (64-bit)
Build time : May 12 2024 - 20:04:00
Path : C:\Program Files\Notepad++\notepad++.exe
Command Line : 
Admin mode : OFF
Local Conf mode : OFF
Cloud Config : OFF
Periodic Backup : OFF
OS Name : Windows 11 Pro for Workstations (64-bit)
OS Version : 23H2
OS Build : 22631.3672
Current ANSI codepage : 1252
Plugins : 
    mimeTools (3.1)
    NppConverter (4.6)
    NppExport (0.4)

Anything else?

I use YAML block scalars to define multiline strings for shell scripts in build pipelines (GitHub Actions workflows and Azure DevOps pipelines), which break the syntax highlighting in Notepad++.

[theonlypwner]

The original post shows parts of the string that were incorrectly highlighted as if they were not part of the string.

Here is an example where parts outside of the string are incorrectly highlighted as if they were part of the string.

- run: |
    # first line of shell script
    # last line of shell script
  if: condition for running step

[
  {
    "run": "# first line of shell script\n# last line of shell script\n", 
    "if": "condition for running step"
  }
]

Notepad++ fails to highlight it correctly.

VS Code correctly highlights it.

GitHub actually highlights this correctly.

[rdipardo]

Duplicate of #9038 (which is itself a cross-post of Lexilla/Scintilla bug #2218).

[theonlypwner]

I agree that the example in the first post is a duplicate, but the example in my second post is not a duplicate.

I will close the issue here and repost in the other issue.