Kind of nitpicky, but this happens to me at least once per day-
1. Start a left click drag to start selecting text.
2. Press alt while the left mouse button is still down.
Note that column selection does not toggle on. While dragging the mouse, pressing & releasing the alt key should toggle back & forth between column selection and regular selection.
Textmate does this, and it's just a nice flexibility thing to have. Sometimes I change my mind mid-drag and it's annoying to have to restart the selection process :)
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