Wrong popups/tooltips offset in the editor (DisplayServer regression)

[nonunknown]

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Bugsquad note: This issue has been confirmed several times already. No need to confirm it further.

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Godot version:

OS/device including version:
Windows 10 x64
Using Vulkan Device #0: AMD - AMD Radeon R7 200 Series

Issue description:
When you click any tab (Project,Scene,Debug) or even right click to add node the popup appears far away form mouse:

Steps to reproduce:
Just interact with engine itself

Workaround
minimize window and maximize again!

[awalone995]

happens only with custom zoom ftw

[KoBeWi]

Related to #45200
This issue goes away when you resize the window.

[sunkper]

I experienced this issue with the default setting. (Windows 10, RX 570). Also can confirm that it goes away when I resize the window.

I found that this only happens when the editor loses focus while it is opening a project (i.e. I alt+tab to other windows while waiting). If the Godot is still focused while loading a project this does not happen.

[mhilbrunner]

I also experience this with default settings on Windows 10 with current master (b1eee24).

I can reproduce this every time like in previous comments: open Godot, while a project loads switch focus to another window, wait, voilá, offsets are all weird. :)