Caption overflow on excessive text in nivo-slider images

I think in terms of the overflow, it might work quite well to place a maximum string length on the Description field that the caption gets its content from, and disable/strip markup, essentially making it a plain text field... otherwise it could easily end up not very pretty.

Then as far as a read more link goes... A form_validate could be added in the slideshow feature to add a simple read more link to the slides with something like:

function julio_slideshow_media_edit_validate ($form, &$form_state) {
  if (!empty($form_state['values']['media_nivo_slider_image_link']['und'][0]['value'])) {

    // It doesn't matter that we're stripping markup from the media_description field, it can still be added to the caption
    $slide_link = l('<strong>Read more &raquo;</strong>', $form_state['values']['media_nivo_slider_image_link']['und'][0]['value'], array('html' => TRUE, 'attributes' => array('class' => array('slideshow-readmore'))));

    $slide_description = $form_state['values']['media_description']['und'][0]['value'] . $slide_link;

    // Append the read more link to the nivo slider caption
    $form_state['values']['media_nivo_slider_image_caption']['und'][0]['value'] = $slide_description;
  }
}

and css to position it:

a.slideshow-readmore {
  position: absolute;
  bottom: 0;
  right: 0;
  padding: 1.5em;
}

This patch

• Puts in a slide heading taking the text from the media title
• Strips all tags but links from the slide caption
• Truncates the slide caption if larger than 330 characters (which seemed the best number to me from playing with the responsive sizing of the slideshow), allowing for link markup
• Adds a read more link if there is a slide link present
• Explains to the user that in slideshow mode, a truncated/filtered description will be used

This approach would also solve #1535568: Nowhere to set a slide heading

Here's a screenshot of the outcome with what would have been overflowing text and no read more link:

I sort of thought all of this might be better done in the slideshow feature, though, unless you're planning on having the ability to create a slideshow of all galleries rather than just the front page one?

This looks great, though I haven't had a chance to test yet. Yes, ideally this would be in the slideshow feature. I'll check this out further as soon as I have time.

Does text_summary() allow for links etc being in there? Bit lazy to ask rather than to look, but that's great, wish I'd known about that function ;-)