Call completer: safe call with nullable receiver has nullable return type #KT-11007 Fixed

compiler/testData/diagnostics/tests/smartCasts/safecalls/insideIfExpr.kt

@@ -0,0 +1,43 @@
+// See KT-11007: Wrong smart cast to not-null type after safe calls in if / when expression
+
+val String.copy: String
+    get() = this
+
+fun foo() {
+    val s: String? = null
+    val ss = if (true) {
+        s?.length
+    } else {
+        s?.length
+    }
+    ss<!UNSAFE_CALL!>.<!>hashCode() // Smart-cast to Int, should be unsafe call
+    val sss = if (true) {
+        s?.copy
+    }
+    else {
+        s?.copy
+    }
+    sss<!UNSAFE_CALL!>.<!>length
+}
+
+class My {
+    val String.copy2: String
+        get() = this
+
+    fun foo() {
+        val s: String? = null
+        val ss = if (true) {
+            s?.length
+        } else {
+            s?.length
+        }
+        ss<!UNSAFE_CALL!>.<!>hashCode()
+        val sss = if (true) {
+            s?.copy2
+        }
+        else {
+            s?.copy2
+        }
+        sss<!UNSAFE_CALL!>.<!>length
+    }
+}

compiler/testData/diagnostics/tests/smartCasts/safecalls/insideIfExpr.txt

@@ -0,0 +1,13 @@
+package
+
+public val kotlin.String.copy: kotlin.String
+public fun foo(): kotlin.Unit
+
+public final class My {
+    public constructor My()
+    public final val kotlin.String.copy2: kotlin.String
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}