Touch Zoom with two fingers don't work on Touch screen (but it works on Touch Pad)

[DrPepperBianco]

Description of the new feature/enhancement

When I use two finger to zoom in or out (actually making text bigger or smaller), it works on my touch pad. But it actually don't work on my touch screen.

I think the experience would be much smoother if it worked the same on the touch pad and the touch screen.

What I also get is, if I scroll with finger on the touch screen it works. If I try to scroll with two fingers it flickers, as if the program doesn't realize I using two fingers and tries to read both inputs.

So the case with multiple fingers should probably be detected and handled specifically.

Proposed technical implementation details (optional)

If I use two fingers on the touch screen and move them together or away from each other the font size should decrease or increase respectively, exactly as it is now if I do that on the touch screen.

[carlos-zamora]

This should be a fairly easy thing to implement. Adding the Help-Wanted tag if anybody wants to hop on. The work should be done in the TermControl.cpp file. There's a few pointer-related functions (i.e.: pointerMoved, pointerClick, etc.) that already handle the mouse movements and a few touch events. Now just a matter of expanding on the touch events.

[carlos-zamora]

https://docs.microsoft.com/en-us/windows/uwp/design/input/touch-interactions

Just linking this here for when I (or somebody else) comes by 😊