All notable changes to this project will be documented in this file. This change log follows the conventions of [keepachangelog.com](http://keepachangelog.com/).
* A time-travelling debugger. Navigating forwards and backwards through the event history updates app-db to match. Be careful when using this with a stateful backend; as in the movies if you change too much or go too far back, the future can become unpredictable.
* Massive overhaul to how subscriptions are processed.
* Subscriptions that exist but weren't run, now show up in the subscription panel.
* Subscription creations and disposals that happen during figwheel reloads or otherwise outside of the re-frame event domino cycle are now correctly handled. If any of these happen, they show up in the new section Inter-Epoch Subscriptions.
* All of the actions that happen to a subscription within an epoch are now shown. This lets you spot unusual behaviour like a subscription being created but not-run, or a subscription running multiple times.
* New event panel. This panel shows the coeffects given to your event handler, the effects your event handler produced, and all of the interceptors in the chain.
* Setting to drop low level traces. This reduces the memory overhead of re-frame-trace as we can drop more traces that you are unlikely to want most of the time.
* In the subs panel "Ignore **n** layer 2 subs" is now "Ignore **n** unchanged layer 2 subs". This is a more useful filter, as you can filter out noisy layer 2 subscriptions, while still seeing the changes that do happen to layer 2 subs.
* Layer 2/3 calculations are more accurate now. We now use the last seen layer level when a subscription runs, to inform it's layer level if it was created or destroyed.
There is now a React 16 variant of re-frame-trace available under the version `0.1.16-react16`. If your application uses React 16 and Reagent 0.8.0-alpha2 or higher, this is the version that you will need to use.
* Updated bundled re-frame version to 0.10.3, and bundled reagent version to 0.7.0. This shouldn't impact your project's dependencies as they are source bundled via [mranderson](https://github.com/benedekfazekas/mranderson).
* The app-db panel now has buttons to reset app-db to the state at the beginning or end of any epoch.
* The subscription panel shows subscriptions that were created and destroyed.
* The trace panel automatically filters traces to just the current epoch
* A new timing panel shows basic timing statistics around event processing and rendering. More to come here.
### Changed
* re-frame-trace is now organised around epochs. An epoch includes an event being processed, subscriptions running in response, and the view re-rendering.
* New state snapshotting feature: Click the camera to snapshot app-db, and click the load button to restore to your snapshot. Snapshots only persist for the browser session, they aren't available after reloading the browser.
* App DB expansions and contractions now persist across reloads. Note the [limitations](https://github.com/Day8/re-frame-trace/blob/master/docs/README.md#app-db-path-expansions) with this feature.
* Add a new App State panel. This lets you visualise your application state and inspect it. You can add multiple selections to view a subset of your application state.
### Fixed
* Handle window viewport size changing and other dragging bugs. This _should_ be the last of them, but open an issue if you still find glitches when resizing.
## [0.1.7] - 2017-09-25
### Changed
* Improve style resetting
* Visual improvements
### Fixed
* Fix panel resizing behaviour under edge cases
## [0.1.6] - 2017-09-05
### Added
* Log trace data to the console when clicking on it.
## [0.1.5] - 2017-08-31
### Changed
* Put CSS in resources directory
## [0.1.4] - 2017-08-31
### Added
* Save settings to localstorage to persist across reloads
* Autoscroll to the bottom of the traces panel when at the bottom
* The preloads namespace now adds the tracing panel to the DOM automatically, so you don't need to change any of your app code to bring it in. [#14](https://github.com/Day8/re-frame-trace/pull/14) via [Dexter Gramfors](https://github.com/Dexterminator).
**Migration steps:** Remove any explicit rendering instructions for `day8.re-frame.trace/devtools` in your app, as this is automatically added now.
* There is now a preload namespace you can use to configure re-frame-trace. Install details are in the README.md. [#13](https://github.com/Day8/re-frame-trace/pull/13) via [Dexter Gramfors](https://github.com/Dexterminator).
