Slideshow shows full-size images rather than thumbnails

[nyanpasu64]

The slideshow <img src=""> includes the full-size attachments, even for small slideshows. This easily results in tens of megabytes downloaded, which is wasteful on capped connections and disastrous on slow ones.

After wading through the source code, I've narrowed it down to this line:

https://github.com/Boonstra/Slideshow/blob/master/views/SlideshowPluginSlideshowSlide/frontend_attachment.php#L93

(in retrospect, it would've been faster to search Github for "wp_get_attachment_image_src", rather than tracing my way from

Slideshow/classes/SlideshowPluginSlideshowSettingsHandler.php

Line 248 in 783328d

/**

through about eight function calls.)

You should use the second argument $size to fix this. (https://codex.wordpress.org/Function_Reference/wp_get_attachment_image_src)

To automate this process, you could use https://codex.wordpress.org/Function_Reference/wp_get_attachment_image instead. (I'm not sure if this is the best idea.)