Explore additional column selection gestures

[alexdima]

• analyze all box selection gestures in Visual Studio
• list all mouse gestures currently in use in VS Code
• find out if there are any available mouse gestures which we could map to box selections.

[alexdima]

Visual Studio

Mouse gestures

User Gesture(s)	Result
1. alt down 2. mouse down 3. *mouse move 4. mouse up	- box selection from mouse down position - alt can be released at any time after step 2.
1. mouse down 2. *mouse move 3. alt down 4. *mouse move 5. mouse up	- regular selection from mouse down position until step 4. - once a mouse move is registered with alt pressed, it turns into box selection from mouse down position - alt can be released at any time after the first mouse move at step 4.
1. alt+shift down 2. mouse down 3. *mouse move 4. mouse up	- box selection from anchor position - alt or shift can be released at any time after step 2.
1. shift down 2. mouse down 3. *mouse move 4. alt down 5. *mouse move 6. mouse up	- regular selection from anchor position until step 5. - once a mouse move is registered with alt pressed, it turns into box selection from anchor position - alt or shift can be released at any time after the first mouse move at step 5.

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