Dwifft -> DifferenceKit (#136)

This swaps out Dwifft for DifferenceKit, which uses Paul Heckel's more efficient diffing algo (same one used by IGListKit). Most of the work here is adding layers to avoid Self/associatedtype requirements issues with our protocols. These layers could be removed in the future though, pending changes that would allow this in Swift 5 or generics changes to TableViewModel/CollectionViewModel.

This also fixes #126

.travis.yml

@@ -26,6 +26,9 @@ env:
 
 # Note: travis installs ruby dependencies using bundler automatically, when there's a Gemfile
 
+before_install:
+  - pod repo update # don't use 'bundle exec' because bundler deps haven't been installed yet
+
 script:
   - set -o pipefail
   - xcodebuild -version -sdk

CHANGELOG.md

@@ -9,9 +9,14 @@ The changelog for `ReactiveLists`. Also see the [releases](https://github.com/pl
 
 This release closes the [0.2.0 milestone](https://github.com/plangrid/ReactiveLists/milestone/2).
 
+### Fixed
+
+- Auto-diffing bugs and crashes ([#136](https://github.com/plangrid/ReactiveLists/pull/136), [@benasher44](https://github.com/benasher44))
+
 ### New
 
 - `TableSectionViewModel` and `CollectionSectionViewModel` now implement `Collection` ([#135](https://github.com/plangrid/ReactiveLists/pull/135), [@benasher44](https://github.com/benasher44))
+- [DifferenceKit](https://github.com/ra1028/DifferenceKit) is now used instead of Dwifft for faster diffing ([#136](https://github.com/plangrid/ReactiveLists/pull/136), [@benasher44](https://github.com/benasher44))
 
 0.1.4
 -----

Podfile

@@ -7,7 +7,7 @@ inhibit_all_warnings!
 target 'ReactiveLists' do
     project 'ReactiveLists.xcodeproj'
 
-    pod 'Dwifft', '0.8.0'
+    pod 'DifferenceKit', '0.5.3'
     pod 'SwiftLint', '0.26.0'
 
     target 'ReactiveListsExample' do

Podfile.lock

@@ -1,20 +1,25 @@
 PODS:
-  - Dwifft (0.8)
+  - DifferenceKit (0.5.3):
+    - DifferenceKit/Core (= 0.5.3)
+    - DifferenceKit/UIExtensions (= 0.5.3)
+  - DifferenceKit/Core (0.5.3)
+  - DifferenceKit/UIExtensions (0.5.3):
+    - DifferenceKit/Core
   - SwiftLint (0.26.0)
 
 DEPENDENCIES:
-  - Dwifft (= 0.8.0)
+  - DifferenceKit (= 0.5.3)
   - SwiftLint (= 0.26.0)
 
 SPEC REPOS:
   https://github.com/cocoapods/specs.git:
-    - Dwifft
+    - DifferenceKit
     - SwiftLint
 
 SPEC CHECKSUMS:
-  Dwifft: 463e61d07322fdf83b32ee6975ca1b20708db746
+  DifferenceKit: 2037137305c55a39ff729baa72697efa30b1052d
   SwiftLint: f6b83e8d95ee1e91e11932d843af4fdcbf3fc764
 
-PODFILE CHECKSUM: a43a91afd77a3063737440f03c6ccb9032ab397a
+PODFILE CHECKSUM: cf0cb4ba9c95fd5e4dfb062e0957cd7af7e98e0f
 
 COCOAPODS: 1.5.3