Support indent after comma in parameter lists

platform/lang-impl/src/com/intellij/psi/impl/source/codeStyle/SemanticEditorPosition.java

@@ -147,7 +147,7 @@ public abstract class SemanticEditorPosition {
   public int getStartOffset() {
     return myIterator.getStart();
   }
-  
+
   @SuppressWarnings("unused")
   public boolean isAtAnyOf(@NotNull SyntaxElement... syntaxElements) {
     if (!myIterator.atEnd()) {
@@ -172,6 +172,13 @@ public abstract class SemanticEditorPosition {
     return -1;
   }
 
+  public boolean hasEmptyLineAfter(int offset) {
+    for (int i = offset; i < myIterator.getEnd(); i ++) {
+      if (myChars.charAt(i) == '\n') return true;
+    }
+    return false;
+  }
+
   public EditorEx getEditor() {
     return myEditor;
   }

platform/lang-impl/src/com/intellij/psi/impl/source/codeStyle/lineIndent/IndentCalculator.java

@@ -57,7 +57,13 @@ class IndentCalculator {
       return CharArrayUtil.shiftBackward(currPosition.getChars(), currPosition.getStartOffset(), " \t\n\r");
     }
   };
-  
+
+  public final static BaseLineOffsetCalculator LINE_AFTER = new BaseLineOffsetCalculator() {
+    @Override
+    public int getOffsetInBaseIndentLine(@NotNull SemanticEditorPosition currPosition) {
+      return CharArrayUtil.shiftForward(currPosition.getChars(), currPosition.getStartOffset(), " \t\n\r");
+    }
+  };
   
   @Nullable
   String getIndentString(@Nullable Language language, @NotNull SemanticEditorPosition currPosition) {

platform/lang-impl/src/com/intellij/psi/impl/source/codeStyle/lineIndent/JavaLikeLangLineIndentProvider.java

@@ -85,9 +85,13 @@ public abstract class JavaLikeLangLineIndentProvider implements LineIndentProvid
     if (getPosition(editor, offset).matchesRule(
       position -> position.isAt(Whitespace) &&
                   position.isAtMultiline())) {
-      //noinspection StatementWithEmptyBody
       if (getPosition(editor, offset).before().isAt(Comma)) {
-        // TODO: Add support
+        SemanticEditorPosition position = getPosition(editor,offset);
+        if (position.hasEmptyLineAfter(offset) &&
+            !position.after().isAtAnyOf(ArrayClosingBracket, BlockOpeningBrace, BlockClosingBrace, RightParenthesis) &&
+            !position.isAtEnd()) {
+            return myFactory.createIndentCalculator(NONE, IndentCalculator.LINE_AFTER);
+        }
       }
       else if (getPosition(editor, offset + 1).isAt(BlockClosingBrace)) {
         return myFactory.createIndentCalculator(