gEDA-dev: [patch] keyboard panning support

[Tomaz Solc]

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Hi again

This is another patch (for CVS head) that provides four new scheme
callbacks for keyboard shortcuts: "view-pan-left", "view-pan-right",
"view-pan-up" and "view-pan-down". It also adds a new integer
configuration variable "keyboardpan-gain".

By binding these callbacks to cursor keys it is now possible to move the
viewport only by using the keyboard. The "keyboardpan-gain" controls how
much the viewport moves for each keypress.

Rationale behind this patch:

I've been using XCircuit for quite a few years and I am now trying to
move to GSchem. I found the "x" keyboard shortcut (view-pan-hotkey) and
right mouse button panning to be a bit awkward compared to just pressing
the cursor keys (like in XCircuit). Also at the moment the cursor keys
do not appear to be used for anything.

I hope this patch doesn't count as a major change :)

Best regards
Tomaz Solc
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