Make single diff patch limit configurable

- Creates a new column to hold the single patch limit value on
application_settings
- Allows updating this value through the application_settings API
- Calculates single diff patch collapsing limit based on
diff_max_patch_bytes column
- Updates diff limit documentation
- Adds documentation (with warning) as of how one can update this limit

1 files changed, 21 insertions, 0 deletions

diff --git a/doc/user/admin_area/diff_limits.md b/doc/user/admin_area/diff_limits.md
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+++ b/doc/user/admin_area/diff_limits.md
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+# Diff limits administration
+
+NOTE: **Note:**
+Merge requests and branch comparison views will be affected.
+
+CAUTION: **Caution:**
+These settings are currently under experimental state. They'll
+increase the resource consumption of your instance and should
+be edited mindfully.
+
+1. Access **Admin area > Settings > General**
+1. Expand **Diff limits**
+
+### Maximum diff patch size
+
+This is the content size each diff file (patch) is allowed to reach before
+it's collapsed, without the possibility of being expanded. A link redirecting
+to the blob view will be presented for the patches that surpass this limit.
+
+Patches surpassing 10% of this content size will be automatically collapsed,
+but expandable (a link to expand the diff will be presented).