Guidelines from top ruler are at an angle

Summary:

Horizontal guideline has an angel of 135 degree every time you create it

Steps to reproduce:

• open Inkscape
• move the mouse pointer over the top ruler bar
• left click and hold
• drag the mouse down on the work area

What happened?

Every time you create a horizontal guide line, it has created with 135 degree of angel instead of 0 degree. Vertical guideline works fine

What should have happened?

Horizontal guide line should be created with 0 degree angel (be horizontal not diagonaly)

Sample attachments:

Version Info:

- Inkscape Version: 1.1-dev (a9d5e92, 2020-06-30)
- Operating System: Windows 10 Pro 
- Operating System version: 1903, OS Build 18362.900