Fast search of assignment operations

idea/idea-analysis/src/org/jetbrains/kotlin/idea/search/usagesSearch/OperatorReferenceSearch.kt

@@ -123,6 +123,11 @@ abstract class OperatorReferenceSearcher<TReferenceElement : KtElement>(
                 return BinaryOperatorReferenceSearcher(declaration, operationTokens, searchScope, consumer, optimizer)
             }
 
+            val assignmentOp = OperatorConventions.ASSIGNMENT_OPERATIONS.inverse()[name]
+            if (assignmentOp != null) {
+                return BinaryOperatorReferenceSearcher(declaration, listOf(assignmentOp), searchScope, consumer, optimizer)
+            }
+
             val unaryOp = OperatorConventions.UNARY_OPERATION_NAMES.inverse()[name]
             if (unaryOp != null) {
                 return UnaryOperatorReferenceSearcher(declaration, unaryOp, searchScope, consumer, optimizer)

idea/idea-analysis/src/org/jetbrains/kotlin/idea/search/usagesSearch/conventions.kt

@@ -59,8 +59,5 @@ fun Name.getOperationSymbolsToSearch(): Pair<Set<KtToken>, Class<*>>? {
         DelegatedPropertyResolver.PROPERTY_DELEGATED_FUNCTION_NAME -> return setOf(KtTokens.BY_KEYWORD) to KtPropertyDelegationMethodsReference::class.java
     }
 
-    val assignmentOp = ASSIGNMENT_OPERATIONS.inverse()[this]
-    if (assignmentOp != null) return setOf(assignmentOp) to KtSimpleNameReference::class.java
-
     return null
 }

idea/testData/findUsages/kotlin/conventions/plusAssign.log

@@ -0,0 +1,8 @@
+Checked type of a
+Resolved a += 1
+Resolved a += A(1)
+Searched references to A
+Searched references to a in Kotlin files
+Searched references to parameter a of A.plusAssign(a: A) in Kotlin files
+Used plain search of A.plusAssign(m: Int) in LocalSearchScope:
+    CLASS:A