Code completion fails after existing values in method arguments

[xterao]

When invoking a method on a field-access element that already has a different variable name set in its argument parameter, subsequent suggestions for instance fields and methods were not shown.

The issue occurred because, when collecting the list of elements before the caret, children of the argument-parameter element were incorrectly treated as part of the field-access chain, resulting in an invalid property-access structure.

This update filters out any elements whose parent is the argument-parameter class when gathering preceding elements, so that only the correct elements are retrieved for suggestions.

[Copilot]

Pull Request Overview

This PR addresses a bug in code completion where subsequent instance field and method suggestions were missing due to incorrect element collection prior to the caret position. Key changes include filtering out argument-parameter child elements during completion, new test files covering method parameter use cases, and refactoring of PSI element helper methods to support the updated logic.

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
completePropertyAfterStaticPropertyCallWithMethodParameter.sql	Adds test case to verify completion after a static property call with a method parameter.
completeParameterFirstPropertyWithMethodParameter.sql	Introduces a test for parameter-first property completion using a method parameter.
completeInstancePropertyWithMethodParameter.sql	Adds a test verifying instance property completion with a method parameter.
completeDirectiveInsideForWithMethodParameter.sql	Enhances directive completion tests for for-loop constructs with method parameters.
completeDirectiveFieldInsideIfWithMethodParameter.sql	Adds tests to check directive completion inside if conditions with method parameters.
ProjectDetail.java	Introduces a new static method getProject(String) to retrieve a project from a subProjects list.
SqlCompleteTestDao.java	Declares new DAO methods to support the updated code completion scenarios.
SqlCompleteTest.kt	Updates test harness to include newly added SQL test files and validates various completion scenarios.
PsiElementExtension.kt	Removes an outdated helper function and adds a new utility for symbol identification.
SqlParameterCompletionProvider.kt	Refactors completion provider to remove legacy helper usage and introduce a new findSelfBlocks helper.