Wordpress admin: How to add a custom command to the admin post screen

Question

In Wordpress admin, looking at a custom post type list screen

Task: I need to copy the text of the column "Shortcode" (the text is already shown in the list).

Problem: I cannot access the text as the activated plugin "Post Types Order" inhibits overlaying the text by showing me a mouse pointer as part of some means to move the post to some other position (a feature I need)

My idea: When hovering the mouse over a post a number of command-buttons ("Edit", "QuickEdit" and "Trash") show up on the left hand side as can be seen here

An additional command-button "Copy Shortcode" to this set of commands could do the job for me.

Question: How do I add a button to this list right next to "Trash"? (copying to the clipboard using Javascript should be ok)

Answer 1

I came up with a more comfortable solution that now fills the column "Shortcode" with hyperlinks of the shortcode text. Thus a simple click on the desired shortcode copies the shortcode-text to the clipboard

Here is the code:

// add column 'Shortcode' in admin 'Layouts' list page
    // filter & action
    add_filter( 'manage_posts_columns', 'jg_add_id_column', 5 );
    add_action( 'manage_posts_custom_column', 'jg_id_column_content', 5, 2 );

    //add_filter( 'manage_et_pb_section_columns', 'jg_add_id_column', 5 );
    //add_action( 'manage_et_pb_section_custom_column', 'jg_id_column_content', 5, 2 );

    // display column title
    function jg_add_id_column( $columns ) {
      if( get_post_type( $post_id ) == 'et_pb_layout') {
         $columns['jg_id'] = 'Shortcode';
      }
      return $columns;
    }

    // display column value = shortcode-string
    function jg_id_column_content( $column, $id ) {
      if( get_post_type( $post_id ) == 'et_pb_layout') {
        if( 'jg_id' == $column ) {
          echo '<a id="myButton',$id, '" name="myButton',$id, '" class="myButtonClass">[showmodule id="', $id, '"]</a>';
        }
      }
    }

The Javascript for copying the text to the clipboard was created according to the stackoverflow.com post 'Click button copy to clipboard using jQuery'. Thanks for the helpful comments.