"space within method declaration parentheses" code style option (PY-8818)

python/src/com/jetbrains/python/formatter/PyLanguageCodeStyleSettingsProvider.java

@@ -46,6 +46,7 @@ public class PyLanguageCodeStyleSettingsProvider extends LanguageCodeStyleSettin
                                    "SPACE_AROUND_MULTIPLICATIVE_OPERATORS",
                                    "SPACE_AROUND_SHIFT_OPERATORS",
                                    "SPACE_WITHIN_METHOD_CALL_PARENTHESES",
+                                   "SPACE_WITHIN_METHOD_PARENTHESES",
                                    "SPACE_WITHIN_BRACKETS",
                                    "SPACE_AFTER_COMMA",
                                    "SPACE_BEFORE_COMMA",

python/src/com/jetbrains/python/formatter/PythonFormattingModelBuilder.java

@@ -96,6 +96,7 @@ public class PythonFormattingModelBuilder implements FormattingModelBuilderEx, C
       .around(DOT).spaces(0)
       .before(SEMICOLON).spaceIf(commonSettings.SPACE_BEFORE_SEMICOLON)
       .withinPairInside(LPAR, RPAR, ARGUMENT_LIST).spaceIf(commonSettings.SPACE_WITHIN_METHOD_CALL_PARENTHESES)
+      .withinPairInside(LPAR, RPAR, PARAMETER_LIST).spaceIf(commonSettings.SPACE_WITHIN_METHOD_PARENTHESES)
       .before(LBRACKET).spaceIf(pySettings.SPACE_BEFORE_LBRACKET)
 
       .withinPair(LBRACE, RBRACE).spaceIf(pySettings.SPACE_WITHIN_BRACES)

python/testData/formatter/spaceWithinDeclarationParentheses.py

@@ -0,0 +1,2 @@
+def foo(x, y):
+    pass

python/testData/formatter/spaceWithinDeclarationParentheses_after.py

@@ -0,0 +1,2 @@
+def foo( x, y ):
+    pass

python/testSrc/com/jetbrains/python/PyFormatterTest.java

@@ -317,6 +317,11 @@ public class PyFormatterTest extends PyTestCase {
     doTest();
   }
 
+  public void testSpaceWithinDeclarationParentheses() {  // PY-8818
+    settings().SPACE_WITHIN_METHOD_PARENTHESES = true;
+    doTest();
+  }
+
   private void doTest() {
     myFixture.configureByFile("formatter/" + getTestName(true) + ".py");
     ApplicationManager.getApplication().runWriteAction(new Runnable() {