Feature #1165

Mis à jour par Sebastien Jacquot il y a environ 10 ans

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

Panning:
* CTRL/CMD + (numpad)
* CTRL/CMD - (numpad)

Pan:
* CTRL/CMD + Arrows keys

Reset view:
* CTRL/CMD 0
* CTRL/CMD 0 (numpad)

h3. Validation tests

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

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