Set point to current frame in stack window.
Set point to current frame in stack window.

git-svn-id: 88bbbf8f5798dc67c7e8670b837dd03176c2df4b@347 453b2852-3d18-0410-866e-d09c099698e4

ruby-debug/ruby-debug,ruby-debug/ruby-debug,gfowley/ruby-debug,ruby-debug/ruby-debug,gfowley/ruby-debug,gfowley/ruby-debug