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Patch from Jonas Koelker to add keyboard control support to Pearl.
[originally from svn r9411]
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@ -2958,6 +2958,12 @@ indicating that you are sure the loop does not go through that edge.
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white clue has to be a corner, but don't yet know which way the corner
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turns, you might mark the one way it \e{can't} go with a cross.)
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Alternatively, use the cursor keys to move the cursor. Use the Enter
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key to begin and end keyboard `drag' operations. Use the Space key to
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cancel the drag. Use Ctrl-arrowkey and Shift-arrowkey to simulate a
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left or right click, respectively, on the edge in the given direction
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relative to the cursor, i.e. to draw a segment or a cross.
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(All the actions described in \k{common-actions} are also available.)
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\H{pearl-parameters} \I{parameters, for Pearl}Pearl parameters
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