Keyword completion uses simple prefix matching only

idea/src/org/jetbrains/jet/plugin/completion/CompletionSession.kt

@@ -139,7 +139,7 @@ class BasicCompletionSession(configuration: CompletionSessionConfiguration,
                 }
             }
 
-            KeywordCompletion.complete(parameters, prefixMatcher, collector)
+            KeywordCompletion.complete(parameters, prefixMatcher.getPrefix(), collector)
 
             if (completeReference && !shouldRunOnlyTypeCompletion()) {
                 flushToResultSet()

idea/src/org/jetbrains/jet/plugin/completion/KeywordCompletion.kt

@@ -35,6 +35,7 @@ import com.intellij.psi.PsiWhiteSpace
 import com.intellij.psi.PsiComment
 
 import org.jetbrains.jet.lexer.JetTokens.*
+import com.intellij.openapi.util.text.StringUtil
 
 class KeywordLookupObject(val keyword: String)
 
@@ -48,7 +49,7 @@ object KeywordCompletion {
 
     private val KEYWORD_TO_DUMMY_POSTFIX = mapOf(OUT_KEYWORD to " X")
 
-    public fun complete(parameters: CompletionParameters, prefixMatcher: PrefixMatcher, collector: LookupElementsCollector) {
+    public fun complete(parameters: CompletionParameters, prefix: String, collector: LookupElementsCollector) {
         val position = parameters.getPosition()
 
         if (!GENERAL_FILTER.isAcceptable(position, position)) return
@@ -56,7 +57,7 @@ object KeywordCompletion {
         val parserFilter = buildFilter(position)
         for (keywordToken in ALL_KEYWORDS) {
             val keyword = keywordToken.getValue()
-            if (prefixMatcher.prefixMatches(keyword) && parserFilter(keywordToken)) {
+            if (keyword.startsWith(prefix)/* use simple matching by prefix, not prefix matcher from completion*/ && parserFilter(keywordToken)) {
                 val element = LookupElementBuilder.create(KeywordLookupObject(keyword), keyword)
                         .bold()
                         .withInsertHandler(if (keywordToken !in FUNCTION_KEYWORDS)

idea/testData/completion/keywords/InModifierListInsideClass.kt

@@ -3,5 +3,5 @@ open class Foo {
     p<caret> val foo = 1
 }
 
-// EXIST: private, public, protected, open
-// NUMBER: 4
+// EXIST: private, public, protected
+// NUMBER: 3

idea/testData/completion/keywords/PrefixMatcher.kt

@@ -0,0 +1,9 @@
+// test that sinple prefix matching is used for keywords
+
+p<caret>
+
+// EXIST:  package
+// EXIST:  private
+// EXIST:  protected
+// EXIST:  public
+// NUMBER: 4

idea/tests/org/jetbrains/jet/completion/KeywordCompletionTestGenerated.java

@@ -244,6 +244,12 @@ public class KeywordCompletionTestGenerated extends AbstractKeywordCompletionTes
         doTest(fileName);
     }
     
+    @TestMetadata("PrefixMatcher.kt")
+    public void testPrefixMatcher() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/keywords/PrefixMatcher.kt");
+        doTest(fileName);
+    }
+    
     @TestMetadata("PropertyAccessors.kt")
     public void testPropertyAccessors() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/keywords/PropertyAccessors.kt");