Clicking on a traffic-light opens the history-view.
For example, this is the history-view for heron's 32nd traffic light.
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avatar navigator
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbBAzoNNXK_9K1Gxhdez7lCRz4AXWAQu_2FhaUQov7HC8Njtwb8xu2RuMRAuIOQ4TzYtsgk78D3mUlYJz5c0tUSr1pcwQr8jmqM7Hp4Kag1_3_E9ynBCdTfYlXzich4d0hB_F9mbcKmg/s1600/animal-navigator.png)
Moves you to different animals. Only visible in a group exercise.
- the left-arrow moves to the previous animal.
- the right-arrow moves to the next animal.
- when the diff checkbox is checked, moving to another animal moves to their first traffic-light.
- when the diff checkbox is unchecked, moving to another animal moves to their last traffic-light.
traffic-light navigator
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVNz9Axw6M4ajNhXCkdQ6JxGZrt6gPlHSkVy9lipw5_FDkuRrupDDFw3Q1LQGM3W7F25hnVqJNlnD7aILXR_GZg3VDi339S6MPPcRrab33DGpDB0qTorXke6sLX3Ldd6YfxO906QK-VA/s1600/traffic-light-navigator.png)
Moves you forward and backward through the traffic-lights.
- the small left-arrow moves to the first traffic-light.
- the larger left-arrow moves to the previous traffic-light.
- the current traffic-light in the current colour (eg 32 green).
- the larger right-arrow moves to the next traffic-light.
- the smaller right-arrow moves to the last traffic-light.
traffic lights
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhagBMIh7h-_efAON0GHroOKv7Oqvn6qoZhZPFIj6zGRetliB82WEhdQR4XND3JPuUBaN59EO1KuTL7YvpUUHdkUZv2XQ27xNf4w0Ypzn0OFCyYyQSInZA9_RkwJBQZpb-jjW4q_DPYIg/s1600/traffic-lights.png)
The scrollable traffic-light sequence.
- hover over each traffic-light to show its diff summary in a tool-tip.
- click on any traffic-light to navigate directly to it.
- the current traffic-light is marked with an underbar.
file name
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8-zNBLZwiV016TX8fjoMv0DrtBQJBUEvJN0BA1dCMHkf5646ek1BuLI7OZiSOru-5w5-mMa4HSTaJEJGvWa0oCxOu2YpXpPa85lJpJ6JbI-7BKy_QBXWu24CvP29L2DnsrV9gYpQwHg/s1600/diff-filename.png)
The currently selected filename.
- the number of lines deleted, in red (click to hide/view toggle).
- the number of lines added, in green (click to hide/view toggle).
- the filename (click it to auto-scroll its next diff-chunk into view).
file content
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguhFIXwItwQnLaZaJKno8IR9fo3jvBIGLKBTyJ6l3zhrL8hEs8j3p07PsjyMdNBSlowE5aPvStf9U1rQ1J1ShlA1naQGupKMj66_TAnc4WvUL53g3ehEw4xXRLAKM8Tfqlh-ks_rZQdA/s1600/diff.png)
The currently selected file.
- deleted lines are in light red, there is a - next to the line-number.
- added lines are in light green, there is a + next to the line-number.
forking
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgv8jllrlLVzu-Ne4YdHVX4TRA3fUSCI6lFlEGDCtOns5UhxM9RrPFRluJoleLuSEzSr3rUmprY-O_pRawkvDh9ynHiffuh54A0bN20u9XJzWGEBWTNyWWG_uVkkfSi2zQYyDw2fWTAnw/s320/fork.png)
The fork button.
- creates a brand new exercise, with its own 6-character id.
- the new exercise's starting files will be copied from the currently displayed traffic light.
- a dialog box will ask whether you want an individual exercise or a group exercise.
checking out
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRuyW97alBmaYhBNpAT0OOyi9Gh9dVFmnmAWYvLC2K3sIvdWXIfqvtcYoFPKswgzp09mkwxMdT9TqdseVFzgXlf_ZYE1TADrR4Oj0TGS4iBAgJPhy8ITsTPutEa_7jiu4BQAl601PTBg/s320/checkout.png)
The checkout button.
- checks out (as in git checkout) the files in the currently displayed traffic light, and submits them for test.
- not available from a dashboard review.
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