if-then to safe access: fix for qualified 'this' condition #KT-26662 Fixed

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/implicitReceiver2.kt

@@ -0,0 +1,9 @@
+class Foo {
+    fun foo() {}
+}
+
+fun Foo?.test() {
+    <caret>if (this@test != null) {
+        foo()
+    }
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/implicitReceiver2.kt.after

@@ -0,0 +1,7 @@
+class Foo {
+    fun foo() {}
+}
+
+fun Foo?.test() {
+    this@test?.foo()
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/implicitReceiver3.kt

@@ -0,0 +1,10 @@
+class Foo
+
+class Bar {
+    fun Foo?.test() {
+        <caret>if (this@Bar != null) {
+            bar()
+        }
+    }
+    fun bar() {}
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/implicitReceiver3.kt.after

@@ -0,0 +1,8 @@
+class Foo
+
+class Bar {
+    fun Foo?.test() {
+        this@Bar?.bar()
+    }
+    fun bar() {}
+}