Add global fallback for failed symbol lookups

[Copilot]

When go-to-definition fails to find a symbol in the current scope chain, it now falls back to a project-wide search. Previously returned empty results for symbols defined elsewhere.

Changes

• lib/ruby_language_server/project_manager.rb: Added global search fallback in project_definitions_for after scope chain exhaustion

  • Searches all scopes (classes, modules, methods) by name
  • Only triggers when scope-based search returns empty

• Tests: Added coverage for cross-file/cross-scope lookups of classes and methods

Example

# File: utils.rb
class StringUtils
  def self.format(text)
    text.upcase
  end
end

# File: service.rb
module Services
  class TextProcessor
    def process(input)
      StringUtils.format(input)  # Go-to-definition now works
    end
  end
end

Before: Failed to find StringUtils (not in Services scope chain)
After: Finds definition via global fallback

Note: The fallback searches for scopes (classes, modules, methods) only. Variables/constants are not included in the global fallback to avoid performance issues and maintain locality of variable references.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Fallback if nothing found</issue_title>
<issue_description>If a lookup fails to find any matching constant/variable/method then it should fallback and look for that constant/method anywhere.</issue_description>

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

• Fixes Fallback if nothing found #140

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[kwerle]

No - let's not look for variables.

[Copilot]

Removed variable search from the fallback. The fallback now only searches for scopes (classes, modules, methods). Commit: 7bc7dac

[kwerle]

In the fallback do not look for variables

[Copilot]

In the fallback do not look for variables

Done. The fallback now only searches for scopes and not variables. Also removed the related test. Commit: 7bc7dac