only in patch2:
unchanged:
--- a/core/modules/file/src/Tests/ValidatorTest.php
+++ b/core/modules/file/src/Tests/ValidatorTest.php
@@ -73,6 +73,10 @@ function testFileValidateImageResolution() {
     $errors = file_validate_image_resolution($this->non_image, '50x50', '100x100');
     $this->assertEqual(count($errors), 0, 'Do not check the resolution on non files.', 'File');
 
+    // Exact size.
+    $errors = file_validate_image_resolution($this->image, '88x100', '88x100');
+    $this->assertEqual(count($errors), 0, 'No errors for an image when there is exact resolution.', 'File');
+
     // Minimum size.
     $errors = file_validate_image_resolution($this->image);
     $this->assertEqual(count($errors), 0, 'No errors for an image when there is no minimum or maximum resolution.', 'File');