Wrap images in divs with Banzai and limit max-height.

Add max-height to prevent images from displaying larger than the provided screen size.

Also fix a failing test and add a new one.

CHANGELOG

@@ -4,6 +4,7 @@ v 8.10.0 (unreleased)
   - Replace Haml with Hamlit to make view rendering faster. !3666
   - Wrap code blocks on Activies and Todos page. !4783 (winniehell)
   - Add Sidekiq queue duration to transaction metrics.
+  - Make images fit to the size of the viewport !4810
   - Fix MR-auto-close text added to description. !4836
   - Fix pagination when sorting by columns with lots of ties (like priority)
   - Exclude email check from the standard health check

app/assets/stylesheets/pages/help.scss

@@ -63,5 +63,6 @@
     border: 1px solid $table-border-gray;
     padding: 5px;
     margin: 5px;
+    max-height: calc(100vh - 100px);
   }
 }

app/assets/stylesheets/pages/issuable.scss

@@ -10,6 +10,7 @@
     border: 1px solid $table-border-gray;
     padding: 5px;
     margin: 5px;
+    max-height: calc(100vh - 100px);
   }
 }
 

app/assets/stylesheets/pages/notes.scss

@@ -113,6 +113,7 @@ ul.notes {
           border: 1px solid $table-border-gray;
           padding: 5px;
           margin: 5px 0;
+          max-height: calc(100vh - 100px);
         }
       }
     }

lib/banzai/filter/image_link_filter.rb

@@ -9,6 +9,11 @@ module Banzai
       def call
         doc.xpath('descendant-or-self::img[not(ancestor::a)]').each do |img|
 
+          div = doc.document.create_element(
+            'div',
+            class: 'image-container'
+          )
+
           link = doc.document.create_element(
             'a',
             class: 'no-attachment-icon',
@@ -17,7 +22,10 @@ module Banzai
           )
 
           link.children = img.clone
-          img.replace(link)
+
+          div.children = link
+
+          img.replace(div)
         end
 
         doc

spec/features/atom/users_spec.rb

@@ -61,7 +61,7 @@ describe "User Feed", feature: true  do
       end
 
       it 'should have XHTML summaries in merge request descriptions' do
-        expect(body).to match /Here is the fix: <a[^>]*><img[^>]*\/><\/a>/
+        expect(body).to match /Here is the fix: <\/p><div[^>]*><a[^>]*><img[^>]*\/><\/a><\/div>/
       end
     end
   end

spec/lib/banzai/filter/image_link_filter_spec.rb

@@ -21,4 +21,9 @@ describe Banzai::Filter::ImageLinkFilter, lib: true do
     doc = filter(image('https://i.imgur.com/DfssX9C.jpg'))
     expect(doc.at_css('img')['src']).to eq doc.at_css('a')['href']
   end
+
+  it 'wraps the image with a link and a div' do
+    doc = filter(image('/uploads/e90decf88d8f96fe9e1389afc2e4a91f/test.jpg'))
+    expect(doc.to_html).to include('<div class="image-container">')
+  end
 end