core: deprecate MatCommaInitializer_

samples/cpp/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_new.cpp

@@ -273,9 +273,11 @@ int main(int argc, char *argv[])
     namedWindow("Output3", 1);
     imshow("Input", src);
 
-    kernel = (Mat_<double>(3, 3) << 1, 0, -1,
-              1, 0, -1,
-              1, 0, -1);
+    kernel = Mat_<double>({3, 3}, {
+        1, 0, -1,
+        1, 0, -1,
+        1, 0, -1
+    });
 
     /*
     Uncomment the kernels you want to use or write your own kernels to test out

samples/cpp/tutorial_code/core/mat_mask_operations/mat_mask_operations.cpp

@@ -51,9 +51,11 @@ int main( int argc, char* argv[])
     waitKey();
 
   //![kern]
-    Mat kernel = (Mat_<char>(3,3) <<  0, -1,  0,
-                                   -1,  5, -1,
-                                    0, -1,  0);
+    Mat kernel = Mat_<char>({3,3}, {
+        0, -1,  0,
+        -1,  5, -1,
+        0, -1,  0
+    });
   //![kern]
 
     t = (double)getTickCount();

samples/cpp/tutorial_code/core/mat_the_basic_image_container/mat_the_basic_image_container.cpp

@@ -54,14 +54,9 @@ int main(int,char**)
     //! [matlab]
 
     // create a 3x3 double-precision identity matrix
-    //! [comma]
-    Mat C = (Mat_<double>(3,3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);
-    cout << "C = " << endl << " " << C << endl << endl;
-    //! [comma]
-    // do the same with initializer_list
 
     //! [list]
-    C = (Mat_<double>({0, -1, 0, -1, 5, -1, 0, -1, 0})).reshape(3);
+    Mat C = Mat_<double>({3, 3}, {0, -1, 0, -1, 5, -1, 0, -1, 0});
     cout << "C = " << endl << " " << C << endl << endl;
     //! [list]
 

samples/cpp/tutorial_code/core/univ_intrin/univ_intrin.cpp

@@ -201,9 +201,11 @@ int main(int argc, char *argv[])
     namedWindow("Output", 1);
     imshow("Input", src);
 
-    kernel = (Mat_<float>(3, 3) << 1, 0, -1,
-                                   2, 0, -2,
-                                   1, 0, -1);
+    kernel = Mat_<float>({3, 3}, {
+        1., 0., -1.,
+        2., 0., -2.,
+        1., 0., -1.
+    });
 
     t = (double)getTickCount();
 
@@ -227,4 +229,4 @@ int main(int argc, char *argv[])
     waitKey(0);
 
     return 0;
-}
+}