Compatibility with Image Watermark plugin

Hello,

I tried to use your beautiful plugin with Image Watermark plugin (https://www.ads-software.com/plugins/image-watermark/). And I faced the issue that watermarks are not applied to the video thumbnails.

I investigated some code and made a patch to fix that. Image Watermark plugin uses wp_handle_upload filter to apply watermarks to images in the gallery. I added the following code to the method Video_Thumbnails::save_to_media_library() right before require_once( ABSPATH . 'wp-admin/includes/image.php' );:

apply_filters('wp_handle_upload', array(
	'file' => $upload['file'],
	'url' => $upload['url'],
	'type' => $wp_filetype['type']
), 'upload');

After that watermarks were applied.

I would appreciate if you’ll made this change so I could update your the plugin automatically in future and not lose my code.

If you have github for this plugin, please let me know so I could send pull requests in future.

Thank you

WordPress: v3.9
Video Thumbnails: v2.7.7
Image Watermark: v1.3.1

https://www.ads-software.com/plugins/video-thumbnails/