Use of unassigned variable '$region'

The patch naming convention is not correct. For more details please refer to https://www.drupal.org/docs/develop/git/using-git-to-contribute-to-drupa... →

I reviewed the patch and found some coding standard issues.
Please follow the below suggestion.

/** @var \Drupal\block\BlockInterface $block */
$block = \Drupal::entityTypeManager()
    ->getStorage('block')
    ->load($variables['elements']['#id']);
if ($block) {

Thanks!

Reviewing #4.
The block condition closing is not correct. It should be closed after

if ($variables['base_plugin_id'] === 'search_form_block') {}

Reviewing #5
The patch naming convention is not correct. Please refer to this guideline.
https://www.drupal.org/docs/develop/git/using-git-to-contribute-to-drupa... →

Thanks!

hello @AkashKumar07
I think the patch is working fine can you please describe in detail what's wrong in this patch
so, I will try to resolve this error

+  /** @var \Drupal\block\BlockInterface $block
+   *   The Block variable.
+   */
+  $block = \Drupal::entityTypeManager()

Such comments are not used inside functions/methods. If you are trying to type-hint that variable, then the comment to add is the following one.

/** @var \Drupal\block\BlockInterface $block */
$block = \Drupal::entityTypeManager()
  ->getStorage('block')
  ->load($variables['elements']['#id']);

The issue summary should always describe what should be fixed/changed. Neither the title nor screenshots are sufficient to describe what the issue is, even in the case a patch is provided.
In the case of a bug, the description should also list the steps necessary to reproduce the issue, starting from when the module/theme is installed.