Fix function detection for TODO comments preceding method definitions

[Copilot]

which-function returns the enclosing class/module name when cursor is on a TODO comment between the class definition and a method definition, causing ai-code-implement-todo to report incorrect context.

module Foo
  class Bar
    # TODO remove this function  # <-- Cursor here
    def click_first_available(driver, selectors)
      # ...
    end
  end
end

Before: detects Bar (class)
After: detects Bar#click_first_available (method)

Changes

• New helper ai-code--get-function-name-for-comment: When cursor is on a comment line, looks ahead to the next non-comment code line and returns the more specific function context. Handles common delimiters (., #, ::) and edge cases (nil values, EOF, multiple comment lines).

• Updated ai-code-implement-todo: Calls helper when is-comment is true instead of directly calling which-function.

• Tests: Added test_ai-code-change.el covering basic detection, edge cases, and multi-language comment syntax.

Language-agnostic and backward-compatible—only affects behavior when cursor is on a comment line.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Wrong function detection</issue_title>
<issue_description>Hello,

In the following example:

module Foo
  class Bar
    def baz
    end

    # TODO remove this function and don't use wait_until. When several selectors are passed just use the most sensible one
    def click_first_available(driver, selectors)
      wait = Selenium::WebDriver::Wait.new(timeout: 10)

      Array(selectors).each do |selector|
        strategy, locator = selector.split(':', 2)
        next if locator.nil?

        begin
          element = wait.until { driver.find_element(strategy.to_sym, locator) }
          element.click
          return
        rescue Selenium::WebDriver::Error::NoSuchElementError,
               Selenium::WebDriver::Error::TimeoutError,
               Selenium::WebDriver::Error::ElementClickInterceptedError
          next
        end
      end
    end
  end
end

It uncorrectly generates the text to mention function Bar#baz instead of Bar#click_first_availale.</issue_description>

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

@tninja ai-code-implement-todo use which-function to identify the function context. so the TODO place do have (which-function) == Bar. If the TODO is inside the function body of which-function, it should work as expected

• Fixes Wrong function detection #40

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