Inline-suggestion appearing at previous cursor location
<!-- ⚠️⚠️ Do Not Delete This! bug_report_template ⚠️⚠️ -->
<!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ -->
<!-- 🕮 Read our guide about submitting issues: https://github.com/microsoft/vscode/wiki/Submitting-Bugs-and-Suggestions -->
<!-- 🔎 Search existing issues to avoid creating duplicates. -->
<!-- 🧪 Test using the latest Insiders build to see if your issue has already been fixed: https://code.visualstudio.com/insiders/ -->
<!-- 💡 Instead of creating your report here, use 'Report Issue' from the 'Help' menu in VS Code to pre-fill useful information. -->
<!-- 🔧 Launch with `code --disable-extensions` to check. -->
Does this issue occur when all extensions are disabled?: No (Needs InlineSuggestions from some extension)

<!-- 🪓 If you answered No above, use 'Help: Start Extension Bisect' from Command Palette to try to identify the cause. -->
<!-- 📣 Issues caused by an extension need to be reported directly to the extension publisher. The 'Help > Report Issue' dialog can assist with this. -->
- VS Code Version: 1.60.0
- OS Version: MacOS Catalina 10.15.7

Steps to Reproduce:

1. Use GitHub Copilot. The exact version shouldn't be important, but this was verified using 1.4.2586.
2. Open a blank Python document and enter the following text:

```
thisVariable = 
thatVariable = 
``` 

There are a single space after each `=` sign. Put the cursor on the end of the first line and trigger Copilot inline-suggestion by pressing Backspace then Space. Don't accept it, but press Down-arrow, Backspace, Space. After pressing Down-arrow the suggestion on the first line disappears (as it should), but after the Backspace+space, you may see the suggestion briefly appear again, before the new inline-suggestion appearing on the second line.

This is a bit flaky, and it may not appear every time the cursor is moved. It may also depend on latency to the Copilot server, and so be less pronounced in e.g. North America than in Europe or Asia.

*Edit by @hediet*: This is the buggy behavior:
![Kapture 2021-09-06 at 16 52 18](https://user-images.githubusercontent.com/3774274/132235064-50fbc790-27df-4bf5-9dd3-ccc257036036.gif)
Inline-suggestion appearing at previous cursor location
<!-- ⚠️⚠️ Do Not Delete This! bug_report_template ⚠️⚠️ -->
<!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ -->
<!-- 🕮 Read our guide about submitting issues: https://github.com/microsoft/vscode/wiki/Submitting-Bugs-and-Suggestions -->
<!-- 🔎 Search existing issues to avoid creating duplicates. -->
<!-- 🧪 Test using the latest Insiders build to see if your issue has already been fixed: https://code.visualstudio.com/insiders/ -->
<!-- 💡 Instead of creating your report here, use 'Report Issue' from the 'Help' menu in VS Code to pre-fill useful information. -->
<!-- 🔧 Launch with `code --disable-extensions` to check. -->
Does this issue occur when all extensions are disabled?: No (Needs InlineSuggestions from some extension)

<!-- 🪓 If you answered No above, use 'Help: Start Extension Bisect' from Command Palette to try to identify the cause. -->
<!-- 📣 Issues caused by an extension need to be reported directly to the extension publisher. The 'Help > Report Issue' dialog can assist with this. -->
- VS Code Version: 1.60.0
- OS Version: MacOS Catalina 10.15.7

Steps to Reproduce:

1. Use GitHub Copilot. The exact version shouldn't be important, but this was verified using 1.4.2586.
2. Open a blank Python document and enter the following text:

```
thisVariable = 
thatVariable = 
``` 

There are a single space after each `=` sign. Put the cursor on the end of the first line and trigger Copilot inline-suggestion by pressing Backspace then Space. Don't accept it, but press Down-arrow, Backspace, Space. After pressing Down-arrow the suggestion on the first line disappears (as it should), but after the Backspace+space, you may see the suggestion briefly appear again, before the new inline-suggestion appearing on the second line.

This is a bit flaky, and it may not appear every time the cursor is moved. It may also depend on latency to the Copilot server, and so be less pronounced in e.g. North America than in Europe or Asia.

*Edit by @hediet*: This is the buggy behavior:
![Kapture 2021-09-06 at 16 52 18](https://user-images.githubusercontent.com/3774274/132235064-50fbc790-27df-4bf5-9dd3-ccc257036036.gif)