Add # region / # endregion folding support for makefiles

[Copilot]

• Create makefile-language-configuration.json with # region / # endregion folding markers
• Add languages contribution to package.json referencing the new language config
• Update CHANGELOG.md citing issue region and endregion support please in makefile #544
• Make folding markers case-insensitive to support # Region, # REGION, etc.
• Validate JSON syntax and regex patterns
• Run code review and security checks

Original prompt

---

This section details on the original issue you should resolve

<issue_title>region and endregion support please in makefile</issue_title>
<issue_description>Hi,

Is it possible to add support in vscode for # region and # endregion block like in other supported language.

For instance:

# region - ANSI colors support
COLOR_BLUE:=34
COLOR_CYAN:=36
COLOR_GRAY:=30
COLOR_GREEN:=32
COLOR_PURPLE:=35
COLOR_RED:=31
COLOR_WHITE:=37
COLOR_YELLOW:=33

_CYAN   := "\e[1;${COLOR_CYAN}m%s\033[0m %s\n"   # F.i. printf $(_CYAN)   "Info xxx"
_GRAY   := "\e[1;${COLOR_GRAY}m%s\033[0m %s\n"   # F.i. printf $(_GRAY)   "ipso lorem"
_GREEN  := "\e[1;${COLOR_GREEN}m%s\033[0m %s\n"  # F.i. printf $(_GREEN)  "Success - xxx"
_RED    := "\e[1;${COLOR_RED}m%s\033[0m %s\n"    # F.i. printf $(_RED)    "Error - xxx"
_WHITE  := "\e[1;${COLOR_WHITE}m%s\033[0m %s\n"  # F.i. printf $(_WHITE)  "ispo lorem"
_YELLOW := "\e[1;${COLOR_YELLOW}m%s\033[0m %s\n" # F.i. printf $(_YELLOW) "ispo lorem"
# endregion

I would like to be able to fold the ANSI color block.

(as you can see, folding is not supported here above)

For information, code folding already supported when there is indentation like in:

# region - help
help:
      # any valid code 
# endregion

(as you can see, folding is well supported here above as soon as there is an indentation)

Thanks!
</issue_description>

<agent_instructions>After addressing this issue described here, please update the changelog citing issue #544.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@gcampbell-msft @cavo789 Thanks for the request! I'll mark this as a feature request and we'll keep it under consideration in future planning.

• Fixes region and endregion support please in makefile #544

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[snehara99]

@copilot does this handle scenarios where region has extra text such as # region - ANSI colors or when it's capitalized like # Region or # REGION?

[Copilot]

@copilot does this handle scenarios where region has extra text such as # region - ANSI colors or when it's capitalized like # Region or # REGION?

Extra text like # region - ANSI colors was already handled by the \b word boundary (no end-of-line anchor). However, capitalized variants like # Region or # REGION were not matched. Updated the regex to use character classes for case-insensitive matching in b449ef5. All these now work:

• # region, # Region, # REGION
• # region - ANSI colors
• #region (no space)
• # endregion, # Endregion, # ENDREGION