image_dimensions_scale() moved to \Drupal\Component\Image\Image::scaleImage()

Function image_dimensions_scale() has been moved to a component and now lives under \Drupal\Component\Image\Image::scaleDimensions(). image_dimensions_scale() is still available, but it is marked as deprecated and it's usage is discouraged.

Usage before this change

$modified = image_dimensions_scale($dimensions, $target_width, $target_height);

if ($modified) {
  // use new dimensions.
}

After this change

use \Drupal\Component\Image\Image
;
$modified = Image::scaleDimensions($dimensions, $target_width, $target_height);

if ($modified) {
  // use new dimensions.
}