PY-16904 Preserve none indent when updating Numpy docstring

python/src/com/jetbrains/python/documentation/docstrings/SectionBasedDocStringUpdater.java

@@ -299,7 +299,7 @@ public abstract class SectionBasedDocStringUpdater extends DocStringUpdater<Sect
   protected String getFieldIndent(@NotNull Section section, @NotNull SectionField field) {
     final String titleIndent = getSectionIndent(section);
     final String fieldIndent = getLineIndent(getFieldStartLine(field));
-    final int diffSize = Math.max(1, PyIndentUtil.getLineIndentSize(fieldIndent) - PyIndentUtil.getLineIndentSize(titleIndent));
+    final int diffSize = Math.max(0, PyIndentUtil.getLineIndentSize(fieldIndent) - PyIndentUtil.getLineIndentSize(titleIndent));
     return StringUtil.repeatSymbol(' ', diffSize);
   }
 

python/testData/intentions/afterNumpyAddMissingParameterPreservesNoneIndent.py

@@ -0,0 +1,8 @@
+def f(param1, param2):
+    """
+    Parameters
+    ----------
+    param1
+    param2 : object
+
+    """

python/testData/intentions/beforeNumpyAddMissingParameterPreservesNoneIndent.py

@@ -0,0 +1,7 @@
+def <caret>f(param1, param2):
+    """
+    Parameters
+    ----------
+    param2 : object
+
+    """

python/testSrc/com/jetbrains/python/intentions/PyIntentionTest.java

@@ -550,6 +550,11 @@ public class  PyIntentionTest extends PyTestCase {
     }
   }
 
+  // PY-16904
+  public void testNumpyAddMissingParameterPreservesNoneIndent() {
+    doDocAddMissingParamsTest(DocStringFormat.NUMPY);
+  }
+
   // PY-9795
   public void testAddMissingParamsInGoogleDocString() {
     doDocAddMissingParamsTest(DocStringFormat.GOOGLE);