PY-71972 "Go to declaration or Usages" doesn't work for instance fields from the constructor.

TextOffset is used to retrieve target element here: TargetElementUtilBase#getNamedElement.

(cherry picked from commit 5c9d721e6870079e4bf86ab7e5c8efb0be5810b0)

IJ-CR-132893

GitOrigin-RevId: 3d6c231d22e4493ce853f8c66e89c584a0834e56

python/python-psi-impl/src/com/jetbrains/python/psi/impl/PyTargetExpressionImpl.java

@@ -71,6 +71,11 @@ public class PyTargetExpressionImpl extends PyBaseElementImpl<PyTargetExpression
     pyVisitor.visitPyTargetExpression(this);
   }
 
+  @Override
+  public int getTextOffset() {
+    return PyTargetExpression.super.getTextOffset();
+  }
+
   @Nullable
   @Override
   public String getName() {

python/testSrc/com/jetbrains/python/PyNavigationTest.kt

@@ -80,6 +80,19 @@ class PyNavigationTest : PyTestCase() {
                                          "print(va<caret>r)")
   }
 
+  // PY-71972
+  fun testGotToDeclarationOrUsagesOnInstanceAttributeDefinitionShowsUsages() {
+    doTestGotoDeclarationOrUsagesOutcome(GTDUOutcome.SU, """
+          class C:
+              def __init__(self, val):
+                  self.va<caret>l = val
+          
+              def __str__(self):
+                  return f"{self.val} {self.val}"
+          """.trimIndent()
+    )
+  }
+
   fun testGotoDeclarationOnInitialization() {
     myFixture.configureByText(
       "a.py",