Redundant async inspection: support case with explicit scope

#KT-28504 Fixed

idea/testData/inspectionsLocal/coroutines/redundantAsync/coroutines.lib.kt

@@ -41,4 +41,7 @@ suspend fun <T> withContext(
 
 suspend fun <R> coroutineScope(block: suspend CoroutineScope.() -> R): R = GlobalScope.block()
 
+operator fun CoroutineContext.plus(other: CoroutineContext): CoroutineContext {
+    TODO()
+}
 

idea/testData/inspectionsLocal/coroutines/redundantAsync/explicitScope.kt

@@ -1,9 +1,7 @@
 // WITH_RUNTIME
-// PROBLEM: none
 
 package kotlinx.coroutines
 
 suspend fun test(ctx: CoroutineContext, scope: CoroutineScope) {
-    // Does not work yet (1.3.11)
     scope.<caret>async(ctx) { 42 }.await()
 }

idea/testData/inspectionsLocal/coroutines/redundantAsync/explicitScope.kt.after

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+
+package kotlinx.coroutines
+
+suspend fun test(ctx: CoroutineContext, scope: CoroutineScope) {
+    withContext(scope.coroutineContext + ctx) { 42 }
+}

idea/testData/inspectionsLocal/coroutines/redundantAsync/explicitScopeNamed.kt

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+
+package kotlinx.coroutines
+
+suspend fun test(ctx: CoroutineContext, scope: CoroutineScope) {
+    scope.<caret>async(context = ctx) { 42 }.await()
+}

idea/testData/inspectionsLocal/coroutines/redundantAsync/explicitScopeNamed.kt.after

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+
+package kotlinx.coroutines
+
+suspend fun test(ctx: CoroutineContext, scope: CoroutineScope) {
+    withContext(context = scope.coroutineContext + ctx) { 42 }
+}

idea/testData/inspectionsLocal/coroutines/redundantAsync/explicitScopeNoContext.kt

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+
+package kotlinx.coroutines
+
+suspend fun test(scope: CoroutineScope) {
+    scope.<caret>async() { 42 }.await()
+}

idea/testData/inspectionsLocal/coroutines/redundantAsync/explicitScopeNoContext.kt.after

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+
+package kotlinx.coroutines
+
+suspend fun test(scope: CoroutineScope) {
+    withContext(scope.coroutineContext) { 42 }
+}