[WIP] Add SwapLinesUp/Down commands with Alt+Up/Down #90
+210
−3
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Feature
Swap the lines of selection with the adjucent one.
This is same as Alt+Up/Down in Visual Studio, Ctrl+Shift+Up/Down in Sublime Text, etc.
Sample
And with selection.
Issue
I'm now stuck with how to implement "selection restoration". I want to preserve the state of selection after executing the commands as I examplified above. In current implementation, the selection is cleared.