ChangeFunctionReturnTypeFix for TYPE_MISMATCH error

idea/testData/quickfix/typeMismatch/afterTypeMismatchInInitializer.kt

@@ -0,0 +1,2 @@
+// "Change 'foo' function return type to 'String'" "true"
+fun foo(): String = <caret>""

idea/testData/quickfix/typeMismatch/afterTypeMismatchInReturnStatement.kt

@@ -0,0 +1,4 @@
+// "Change 'foo' function return type to 'String'" "true"
+fun foo(): String {
+    return ""<caret>
+}

idea/testData/quickfix/typeMismatch/beforeTypeMismatchInInitializer.kt

@@ -0,0 +1,2 @@
+// "Change 'foo' function return type to 'String'" "true"
+fun foo(): Int = <caret>""

idea/testData/quickfix/typeMismatch/beforeTypeMismatchInReturnStatement.kt

@@ -0,0 +1,4 @@
+// "Change 'foo' function return type to 'String'" "true"
+fun foo() {
+    return ""<caret>
+}