Formatting: omit blank lines between 'when' and left brace. Test is included.

idea/src/org/jetbrains/jet/plugin/formatter/JetFormattingModelBuilder.java

@@ -106,7 +106,10 @@ public class JetFormattingModelBuilder implements FormattingModelBuilder {
                 .afterInside(COLON, TYPE_PARAMETER).spaceIf(jetSettings.SPACE_AFTER_EXTEND_COLON)
 
                 .between(VALUE_ARGUMENT_LIST, FUNCTION_LITERAL_EXPRESSION).spaces(1)
+
+                //when
                 .aroundInside(ARROW, WHEN_ENTRY).spaceIf(jetSettings.SPACE_AROUND_WHEN_ARROW)
+                .beforeInside(LBRACE, WHEN).spacing(1, 1, 0, true, 0)          //omit blank lines before '{' in 'when' statement
                 ;
     }
 

idea/testData/formatter/WhenLinesBeforeLbrace.kt

@@ -0,0 +1,17 @@
+fun f(x: Any): Int {
+    return when (x)
+
+
+
+
+
+
+
+
+
+
+    {
+        is Int->1
+        else->0
+    }
+}

idea/testData/formatter/WhenLinesBeforeLbrace_after.kt

@@ -0,0 +1,7 @@
+fun f(x: Any): Int {
+    return when (x)
+    {
+        is Int -> 1
+        else -> 0
+    }
+}

idea/tests/org/jetbrains/jet/formatter/JetFormatterTest.java

@@ -135,6 +135,10 @@ public class JetFormatterTest extends AbstractJetFormatterTest {
         doTestWithInvert();
     }
 
+    public void testWhenLinesBeforeLbrace() throws Exception {
+        doTest();
+    }
+
     @Override
     public void doTest() throws Exception {
         String originalFileText = AbstractJetFormatterTest.loadFile(getTestName(false) + ".kt");