Formatter: left brace formatting for "when" expression and "when" entries

idea/testData/formatter/WhenLineBreak.after.inv.kt

@@ -0,0 +1,39 @@
+fun f() {
+    when(c) {
+        a -> {
+        }
+        b -> j
+        else -> {
+        }
+    }
+
+    when(c) {
+        a -> {
+        }
+        b -> j
+        else -> {
+        }
+    }
+
+    when(c) {
+        a -> {
+        }
+        b -> j
+        else -> {
+        }
+    }
+
+    when(c) //eol comment
+    {
+        a -> //eol comment
+        {
+        }
+        b -> j
+        else -> //eol comment
+        {
+        }
+    }
+}
+
+
+// SET_TRUE: LBRACE_ON_NEXT_LINE