post previews: fix css for captioned post previews.

Captioned post previews (previews with the pool name, similarity, or
size beneath) need to have `height: auto` set, otherwise they'll default
to `height: 154px` (just enough for the image) and the caption won't be visible.

app/javascript/src/styles/specific/posts.scss

@@ -13,12 +13,14 @@ article.post-preview {
     @include inline-block;
   }
 
-  &.pooled {
-    height: 214px;
+  &.captioned {
+    height: auto;
+    vertical-align: text-top;
   }
 
   .desc {
    font-size: 80%;
+   margin-bottom: 0;
   }
 
   img {
@@ -34,19 +36,6 @@ article.post-preview {
   }
 }
 
-#iqdb-similar {
-  overflow: hidden;
-
-  .post-preview {
-    height: auto;
-    margin-bottom: 0;
-  }
-
-  p {
-    margin-bottom: 0;
-  }
-}
-
 #saved-searches-nav {
   margin-top: 1em;
 }

app/presenters/post_presenter.rb

@@ -27,7 +27,7 @@ class PostPresenter < Presenter
       cropped_src = post.preview_file_url
     end
 
-    html =  %{<article itemscope itemtype="http://schema.org/ImageObject" id="post_#{post.id}" class="#{preview_class(post, options[:pool], options)}" #{data_attributes(post)}>}
+    html =  %{<article itemscope itemtype="http://schema.org/ImageObject" id="post_#{post.id}" class="#{preview_class(post, options)}" #{data_attributes(post)}>}
     if options[:tags].present? && !CurrentUser.is_anonymous?
       tag_param = "?tags=#{CGI::escape(options[:tags])}"
     elsif options[:pool_id] || options[:pool]
@@ -72,10 +72,10 @@ class PostPresenter < Presenter
     html.html_safe
   end
 
-  def self.preview_class(post, description = nil, options = {})
+  def self.preview_class(post, options = {})
     klass = "post-preview"
     # klass << " large-cropped" if post.has_cropped? && options[:show_cropped]
-    klass << " pooled" if description
+    klass << " captioned" if options.values_at(:pooled, :size, :similarity).any?(&:present?)
     klass << " post-status-pending" if post.is_pending?
     klass << " post-status-flagged" if post.is_flagged?
     klass << " post-status-deleted" if post.is_deleted?