Add quickfix for ASSIGN_OPERATOR_AMBIGUITY on mutable collection '+=', '-='

KT-26236 Fixed

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/arrayList.kt

@@ -0,0 +1,7 @@
+// "Change 'list' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    var list = ArrayList<Int>()
+    list <caret>-= 2
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/arrayList.kt.after

@@ -0,0 +1,7 @@
+// "Change 'list' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    val list = ArrayList<Int>()
+    list <caret>-= 2
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/classVariable.kt

@@ -0,0 +1,14 @@
+// "Change 'list' to val" "false"
+// ACTION: Replace overloaded operator with function call
+// ACTION: Replace with 'plusAssign()' call
+// ACTION: Replace with ordinary assignment
+// ERROR: Assignment operators ambiguity: <br>public operator fun <T> Collection<Int>.plus(element: Int): List<Int> defined in kotlin.collections<br>@InlineOnly public inline operator fun <T> MutableCollection<in Int>.plusAssign(element: Int): Unit defined in kotlin.collections
+// WITH_RUNTIME
+
+class Test {
+    var list = mutableListOf(1)
+
+    fun test() {
+        list <caret>+= 2
+    }
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/hashMap.kt

@@ -0,0 +1,7 @@
+// "Change 'set' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    var set = HashMap<Int, Int>()
+    set <caret>+= 2 to 2
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/hashMap.kt.after

@@ -0,0 +1,7 @@
+// "Change 'set' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    val set = HashMap<Int, Int>()
+    set <caret>+= 2 to 2
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/hashSet.kt

@@ -0,0 +1,7 @@
+// "Change 'set' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    var set = HashSet<Int>()
+    set <caret>-= 2
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/hashSet.kt.after

@@ -0,0 +1,7 @@
+// "Change 'set' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    val set = HashSet<Int>()
+    set <caret>-= 2
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/mutableList.kt

@@ -0,0 +1,7 @@
+// "Change 'list' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    var list = mutableListOf(1)
+    list <caret>+= 2
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/mutableList.kt.after

@@ -0,0 +1,7 @@
+// "Change 'list' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    val list = mutableListOf(1)
+    list <caret>+= 2
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/mutableMap.kt

@@ -0,0 +1,7 @@
+// "Change 'map' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    var map = mutableMapOf(1 to 1)
+    map <caret>+= 2 to 2
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/mutableMap.kt.after

@@ -0,0 +1,7 @@
+// "Change 'map' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    val map = mutableMapOf(1 to 1)
+    map <caret>+= 2 to 2
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/mutableSet.kt

@@ -0,0 +1,7 @@
+// "Change 'set' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    var set = mutableSetOf(1)
+    set <caret>+= 2
+}

idea/testData/quickfix/assignOperatorAmbiguity/changeToVal/mutableSet.kt.after

@@ -0,0 +1,7 @@
+// "Change 'set' to val" "true"
+// WITH_RUNTIME
+
+fun test() {
+    val set = mutableSetOf(1)
+    set <caret>+= 2
+}