Option to use dragStartDelay only for touch events

[aeslinger0]

Feature Description

Ability to control which events cause dragStartDelay to be used.

Use Case

dragStartDelay works great for touch screen devices to prevent dragging when you meant to scroll, but on the desktop with the mouse it just makes it feel like it's buggy or unresponsive. It'd be great if we had the ability to choose which events it applied to - even better if it defaulted to only applying to touch-screen events.

[aeslinger0]

@crisbeto the PR looks great, exactly what I was looking for. Thanks. We must be getting close to version 9 being released, do you think this will make it in there?

For anyone that needs a workaround until this is released, I use [cdkDragStartDelay]="dragStartDelay" (touchstart)="dragStartDelay = 100" (mousedown)="dragStartDelay = 0" which works surprisingly well.

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