Intention to replace a = b with b.also { a = it }

^KT-22420 Fixed

idea/testData/intentions/convertVariableAssignmentToExpression/.intention

@@ -0,0 +1 @@
+org.jetbrains.kotlin.idea.intentions.ConvertVariableAssignmentToExpressionIntention

idea/testData/intentions/convertVariableAssignmentToExpression/complexLhs.kt

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+object X {
+    var string = "foo"
+}
+
+fun main() {
+    X.string <caret>= "bar"
+}

idea/testData/intentions/convertVariableAssignmentToExpression/complexLhs.kt.after

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+object X {
+    var string = "foo"
+}
+
+fun main() {
+    "bar".also { X.string = it }
+}

idea/testData/intentions/convertVariableAssignmentToExpression/complexRhs.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+object X {
+    var string = "foo"
+}
+
+var target = "baz"
+fun main() {
+    target <caret>= X.string
+}

idea/testData/intentions/convertVariableAssignmentToExpression/complexRhs.kt.after

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+object X {
+    var string = "foo"
+}
+
+var target = "baz"
+fun main() {
+    X.string.also { target = it }
+}

idea/testData/intentions/convertVariableAssignmentToExpression/noAssignment.kt

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: false
+var x = 0
+fun main() {
+    x <caret>== 10
+}

idea/testData/intentions/convertVariableAssignmentToExpression/simple.kt

@@ -0,0 +1,5 @@
+// WITH_RUNTIME
+var x = 5
+fun foo() {
+    x <caret>= 10
+}

idea/testData/intentions/convertVariableAssignmentToExpression/simple.kt.after

@@ -0,0 +1,5 @@
+// WITH_RUNTIME
+var x = 5
+fun foo() {
+    10.also { x = it }
+}