disable WP automatically inserted line breaks after an image

If this is how it looks:

<img class="alignleft size-medium wp-image-8530" alt="..." src="#" width="413" height="275" />
<img class="alignleft size-medium wp-image-8529" alt="..." src="#" width="413" height="275" />

Then you have to put them together like this:

<img class="alignleft size-medium wp-image-8530" alt="..." src="#" width="413" height="275" /><img class="alignleft size-medium wp-image-8529" alt="..." src="#" width="413" height="275" />

Because if you do this (wpautop):

remove_filter( 'the_content', 'wpautop' );
remove_filter( 'the_excerpt', 'wpautop' );

function wpse_wpautop_nobr( $content ) {
    return wpautop( $content, false );
}

add_filter( 'the_content', 'wpse_wpautop_nobr' );
add_filter( 'the_excerpt', 'wpse_wpautop_nobr' );

you will probably break everything you have written, it’s not worth it.