TabView TearOutTabs: New window is moved at exponential speed

### Describe the bug

When the new window has been created with a new tab in it, it will move with some kind of multiple of the mouse movement if it is a tab at the end of the tab list, and there are more than two tabs present. Please see the attached screen clip for an example.

The same happens if the first tab is dragged, but the window is moved to the left on the screen instead.
The same thing appears to happen always if the created window's tabview is empty (no tabs) when created.

### Steps to reproduce the bug

See TabTearOutExample on GitHub:
https://github.com/[bjorn-malmo/bug-free-happiness](https://github.com/bjorn-malmo/bug-free-happiness)

### Expected behavior

_No response_

### Screenshots

https://github.com/user-attachments/assets/f77d2be6-6e56-477f-a6e0-5f135bd81005

### NuGet package version

WinUI 3 - Windows App SDK 1.6.3: 1.6.241114003

### Windows version

Windows 11 (24H2): Build 26100

### Additional context

_No response_

Start by reproducing the issue with the linked TabTearOutExample, focusing on TabView tear-out behavior with tabs at the beginning or end of a list and with an empty tab view. Trace the window movement handling for those cases. Done means the new window follows the pointer at normal speed in each described scenario.

Written by the indexing model from the issue text.