Fix return type for dataclass callable type (PY-28442)

python/src/com/jetbrains/python/codeInsight/stdlib/PyDataclassTypeProvider.kt

@@ -108,7 +108,7 @@ class PyDataclassTypeProvider : PyTypeProviderBase() {
       .mapNotNull { fieldToParameter(cls, it, dataclassParameters.type, ellipsis, context) }
       .toList()
 
-    return PyCallableTypeImpl(parameters, context.getType(cls))
+    return PyCallableTypeImpl(parameters, context.getType(cls)?.let { if (it is PyInstantiableType<*>) it.toInstance() else it })
   }
 
   private fun fieldToParameter(cls: PyClass,

python/testData/inspections/PyTypeCheckerInspection/DataclassClsCallType/a.py

@@ -0,0 +1,11 @@
+from dataclasses import dataclass
+
+
+@dataclass
+class Point:
+    x: int
+    y: int
+
+    @classmethod
+    def from_str(cls, string: str) -> 'Point':
+        return cls(1, 2)

python/testData/inspections/PyTypeCheckerInspection/DataclassClsCallType/dataclasses.py

@@ -0,0 +1,3 @@
+def dataclass(_cls=None, *, init=True, repr=True, eq=True, order=False,
+              unsafe_hash=False, frozen=False):
+    pass

python/testSrc/com/jetbrains/python/inspections/Py3TypeCheckerInspectionTest.java

@@ -297,6 +297,11 @@ public class Py3TypeCheckerInspectionTest extends PyInspectionTestCase {
     runWithLanguageLevel(LanguageLevel.PYTHON37, () -> super.doMultiFileTest());
   }
 
+  // PY-28442
+  public void testDataclassClsCallType() {
+    runWithLanguageLevel(LanguageLevel.PYTHON37, () -> super.doMultiFileTest());
+  }
+
   // PY-26354
   public void testInitializingAttrs() {
     doTestByText("import attr\n" +