Use visual mode for MacVim gvimrc default HIG shift movement mappings.
Use visual mode for MacVim gvimrc default HIG shift movement mappings.

MacVim defaults to using select mode for HIG shift movement mappings,
but select mode has strange behavior and is somewhat confusing.
Remap default key movements from MacVim's gvimrc to visual mode movement
mappings to use more predictable behavior.

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