Feature #1165

Updated by Sebastien Jacquot about 4 years ago

Add keyboard shortcuts to scale and pan in the charts.
Zooming/scaling: Scaling:
* CTRL/CMD +
* CTRL/CMD -

Panning:
* CTRL/CMD + Arrows keys

h3. Validation tests

* create some charts with JFC charts engine
* zoom and pan with keyboard using the above specified keys
* create some charts with R charts engine
* zoom and pan with keyboard using the above specified keys

MD : OK Ubuntu 14.04 and Windows XP

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