When viewing the diff for a changed image file, two bugs occur:
- Both the 'before' and 'after' images link to the 'after' commit
- Visiting the link for either image will cause a error
The first is caused by both image links referencing '@commit.id' rather
than '@commit.parent_id'. The second is caused by the use of
'project_tree_path' which is used for creating links to directories in
the git file tree. 'project_blob_path' which links to files should be
used instead.
Previously, only number of changed files mattered. Now, number of lines to render in the diff are also taken into account.
A hard limit is set, above which diffs are not rendered and users are not allowed to override that. This prevents high server
resource usage with huge commits.
Related to #1745, #2259
In addition, handle large commits for MergeRequests and Compare controllers.
Also fixes a bug where diffs are loaded twice, if user goes directly to merge_requests/:id/diffs URL.
Ryan Mendivil