Mouse dragging cursor accelerates significantly on Mac

This also occurs in 4.14.3

This does not occur on Windows.

Could not get this issue to reproduce while recording the screen with quicktime player, but if you experience it in person it really feels off. Confirmed by another iMac user.

Using a logitech G100s mouse.

Repro 1: Orthographic views

1. Try dragging LMB to create a selection in the Front, Left, or Top viewports
2. See the attached video
   Result: Mouse acceleration increases as you continue to drag.

Note: this also mildly affects vertex painting, although the effect is much less noticeable.

Repro 2: Landscape:

1. Open any project in the editor on mac
2. Select the Landscape mode from the modes panel
3. Click on Create
4. Zoom out in the viewport so you can the landscape
5. Hold down LMB and move the mouse towards an edge of the landscape
   Result: Mouse will accelerate faster as it gets close to the edge

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