Fixed extension properties not completed after "get"

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/CompletionSession.kt

@@ -118,17 +118,16 @@ abstract class CompletionSession(
 
     protected val prefixMatcher = CamelHumpMatcher(prefix)
 
-    protected val descriptorNameFilter: (Name) -> Boolean = run {
-        val nameFilter = prefixMatcher.asNameFilter()
+    private val descriptorStringNameFilter: (String) -> Boolean = run {
+        val nameFilter = prefixMatcher.asStringNameFilter()
         val getOrSetPrefix = listOf("get", "set", "ge", "se", "g", "s").firstOrNull { prefix.startsWith(it) }
         if (getOrSetPrefix != null)
-            nameFilter or prefixMatcher.cloneWithPrefix(prefix.removePrefix(getOrSetPrefix).decapitalizeSmart()).asNameFilter()
+            prefixMatcher.cloneWithPrefix(prefix.removePrefix(getOrSetPrefix).decapitalizeSmart()).asStringNameFilter() or nameFilter
         else
             nameFilter
     }
 
-    private infix fun ((Name) -> Boolean).or(otherFilter: (Name) -> Boolean): (Name) -> Boolean
-            = { this(it) || otherFilter(it) }
+    protected val descriptorNameFilter: (Name) -> Boolean = descriptorStringNameFilter.toNameFilter()
 
     protected val isVisibleFilter: (DeclarationDescriptor) -> Boolean = { isVisibleDescriptor(it, completeNonAccessible = configuration.completeNonAccessibleDeclarations) }
     protected val isVisibleFilterCheckAlways: (DeclarationDescriptor) -> Boolean = { isVisibleDescriptor(it, completeNonAccessible = false) }
@@ -318,12 +317,11 @@ abstract class CompletionSession(
 
         var notImportedExtensions: Collection<CallableDescriptor> = emptyList()
         if (callTypeAndReceiver.shouldCompleteCallableExtensions()) {
-            val nameFilter: (String) -> Boolean = { prefixMatcher.prefixMatches(it) }
             val indicesHelper = indicesHelper(true)
             val extensions = if (runtimeReceiver != null)
-                indicesHelper.getCallableTopLevelExtensions(callTypeAndReceiver, listOf(runtimeReceiver.type), nameFilter)
+                indicesHelper.getCallableTopLevelExtensions(callTypeAndReceiver, listOf(runtimeReceiver.type), descriptorStringNameFilter)
             else
-                indicesHelper.getCallableTopLevelExtensions(callTypeAndReceiver, expression!!, bindingContext, nameFilter)
+                indicesHelper.getCallableTopLevelExtensions(callTypeAndReceiver, expression!!, bindingContext, descriptorStringNameFilter)
 
             val pair = extensions.partition { isImportableDescriptorImported(it) }
             variants += pair.first

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/CompletionUtils.kt

@@ -118,21 +118,19 @@ fun rethrowWithCancelIndicator(exception: ProcessCanceledException): ProcessCanc
     return exception
 }
 
-fun PrefixMatcher.asNameFilter() = { name: Name ->
-    if (name.isSpecial) {
-        false
-    }
-    else {
-        val identifier = name.identifier
-        if (prefix.startsWith("$")) { // we need properties from scope for backing field completion
-            prefixMatches("$" + identifier)
-        }
-        else {
-            prefixMatches(identifier)
-        }
-    }
+fun PrefixMatcher.asNameFilter(): (Name) -> Boolean {
+    return { name -> !name.isSpecial && prefixMatches(name.identifier) }
 }
 
+fun PrefixMatcher.asStringNameFilter() = { name: String -> prefixMatches(name) }
+
+fun ((String) -> Boolean).toNameFilter(): (Name) -> Boolean {
+    return { name -> !name.isSpecial && this(name.identifier) }
+}
+
+infix fun <T> ((T) -> Boolean).or(otherFilter: (T) -> Boolean): (T) -> Boolean
+        = { this(it) || otherFilter(it) }
+
 fun LookupElementPresentation.prependTailText(text: String, grayed: Boolean) {
     val tails = tailFragments
     clearTail()

idea/idea-completion/testData/basic/multifile/ExtensionsAndGetPrefix/ExtensionsAndGetPrefix.dependency.kt

@@ -0,0 +1,4 @@
+package dependency
+
+val String.notImportedExtension: Int
+    get() = 0

idea/idea-completion/testData/basic/multifile/ExtensionsAndGetPrefix/ExtensionsAndGetPrefix.kt

@@ -0,0 +1,9 @@
+val String.thisFileExtension: Int
+    get() = 0
+
+fun f() {
+    "".get<caret>
+}
+
+// EXIST: thisFileExtension
+// EXIST: notImportedExtension

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/MultiFileJvmBasicCompletionTestGenerated.java

@@ -119,6 +119,12 @@ public class MultiFileJvmBasicCompletionTestGenerated extends AbstractMultiFileJ
         doTest(fileName);
     }
 
+    @TestMetadata("ExtensionsAndGetPrefix")
+    public void testExtensionsAndGetPrefix() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/basic/multifile/ExtensionsAndGetPrefix/");
+        doTest(fileName);
+    }
+
     @TestMetadata("ExtensionsForSmartCast")
     public void testExtensionsForSmartCast() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/basic/multifile/ExtensionsForSmartCast/");