Repository: elm-tooling/elm-language-server (ts)

Issue:
Renaming custom type constructors also renames imported modules when names match
When trying to rename a custom type constructor whose name matches one of the imported module names, the imported module name gets renamed along with the constructor.

Take following minimal example:
```elm
module Test exposing (..)

import Html

type Model = Html

value : Model
value = Html

view : Html.Html msg
view = Html.p [] []
```

When you rename the constructor `Html` in VSCode, you currently end up with the following result:

```elm
module Test exposing (..)

import Foo -- this is incorrect, this has to remain `Html`

type Model = Foo

value : Model
value = Foo

view : Html.Html msg
view = Html.p [] []
```

## Expected Behavior
Renaming a constructor should rename only the constructor along with all the usages of the constructor.

## Current Behavior
Renaming a constructor renames not only the constructor and all the usages of the constructor but also _unrelated but identically named imports_.

## Possible Solution
???

## Steps to Reproduce (for bugs)
1. Paste the minimal example from this description in a new module in VSCode.
2. Use the rename action in VSCode to rename the `Html` constructor, rename it to something different.

=> `import Html` line will be incorrectly renamed

## Context
I was trying to rename a value constructor.

## Your Environment
<!--- Include as many relevant details about the environment you experienced the bug in -->
* Version used: 2.1.0
* Editor used: VSCode 1.55.2
* Environment name and version (e.g. node.js 5.4): node 12.20.1
* Operating System and version: Darwin x64 19.6.0 (OSX 10.15.7)



Pull request description:
Union constructor should not reference import with the same name
Fixes #580.

Patch:
diff --git a/src/util/treeUtils.ts b/src/util/treeUtils.ts
index bfb1521..d08fddc 100644
--- a/src/util/treeUtils.ts
+++ b/src/util/treeUtils.ts
@@ -197,7 +197,8 @@ export class TreeUtils {
             (moduleNamePrefix &&
               a.text === `${moduleNamePrefix}.${unionConstructorName}`)) &&
           a.parent &&
-          a.parent.type !== "type_ref",
+          a.parent.type !== "type_ref" &&
+          a.parent.type !== "import_clause",
       );
       return result.length === 0 ? undefined : result;
     }


Test patch:
diff --git a/test/referencesProviderTests/typeReferences.test.ts b/test/referencesProviderTests/typeReferences.test.ts
index 58fd027..dd069a3 100644
--- a/test/referencesProviderTests/typeReferences.test.ts
+++ b/test/referencesProviderTests/typeReferences.test.ts
@@ -127,6 +127,26 @@ func a =
         M.A ->
       --X
           ""
+`;
+    await testBase.testReferences(source);
+  });
+
+  it(`import with same name is not a union constructor reference - issue #580`, async () => {
+    const source = `
+--@ Test.elm
+module Test exposing (..)
+
+import Html
+
+type Model = Html
+            --^
+
+value : Model
+value = Html
+       --X
+
+view : Html.Html msg
+view = Html.p [] []
 `;
     await testBase.testReferences(source);
   });