Issue #3292350 by O'Briat, KlemenDEV, hswong3i, smustgrave, quietone: Update the file size in file_validate_image_resolution after resizing

(cherry picked from commit 1a3d72bc67)
(cherry picked from commit 2340e939ed)

core/modules/file/file.module

@@ -295,6 +295,8 @@ function file_validate_image_resolution(FileInterface $file, $maximum_dimensions
         if ($image->scale($width, $height)) {
           $scaling = TRUE;
           $image->save();
+          // Update the file size now that the image has been resized.
+          $file->setSize($image->getFileSize());
           if (!empty($width) && !empty($height)) {
             $message = t('The image was resized to fit within the maximum allowed dimensions of %dimensions pixels. The new dimensions of the resized image are %new_widthx%new_height pixels.',
               [

core/modules/file/tests/src/Kernel/LegacyValidatorTest.php

@@ -37,6 +37,7 @@ class LegacyValidatorTest extends FileManagedUnitTestBase {
     /** @var \Drupal\Core\File\FileSystemInterface $file_system */
     $file_system = \Drupal::service('file_system');
     $this->image->setFilename($file_system->basename($this->image->getFileUri()));
+    $this->image->setSize(@filesize($this->image->getFileUri()));
 
     $this->nonImage = File::create();
     $this->nonImage->setFileUri('core/assets/vendor/jquery/jquery.min.js');
@@ -191,6 +192,8 @@ class LegacyValidatorTest extends FileManagedUnitTestBase {
       // Verify that the image was scaled to the correct width and height.
       $this->assertLessThanOrEqual(10, $image->getWidth());
       $this->assertLessThanOrEqual(5, $image->getHeight());
+      // Verify that the file size has been updated after resizing.
+      $this->assertEquals($this->image->getSize(), $image->getFileSize());
 
       // Once again, now with negative width and height to force an error.
       copy('core/misc/druplicon.png', 'temporary://druplicon.png');