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Give custom blocks template suggestions by type and views blocks by view ID

<?php
/**
* Implements hook_theme_suggestions_HOOK_alter() for blocks.
*/
function kidneys_theme_suggestions_block_alter(array &$suggestions, array $variables) {
  if (
$variables['elements']['#base_plugin_id'] == 'block_content') {
   
$block = $variables['elements']['content']['#block_content'];
   
$suggestions[] = 'block__' . $block->bundle();
  }
  if (
$variables['elements']['#base_plugin_id'] == 'views_block') {
   
$suggestions[] = 'block__views_block__' . $variables['elements']['content']['#view_id'];
  }
}
?>

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