check if FILTER(“the_content”) is being executed in `the_post()`

Found solution here, to use in_the_loop() (but read comment below my answer too):

add_filter( 'the_content', 'custom_content' );

function custom_content( $content ) {
    if ( in_the_loop() ) {
        // ....
    }
    return $content;
}

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