Extend Mode

This is used for extending the current selection.

For example, selecting multiple words or multiple lines.

It behaves more or less the same as click-and-drag in the textbox or text area of common GUI applications, but imagine being able to tune both ends, unlike using a mouse where an incorrect selection means you have to start over again.

When selection extension is enabled:

1. Each selection is composed of two ranges (originally one range).
2. There's only one moveable range at a time.
3. Every character between the two ranges, including the two ranges, is selected
4. Selection-wise actions work on the extended range
5. Press ESC to disable selection extension

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