windows: Use exact scale factor

[kazatsuyu]

Maybe several problem in this will be solved by #9438, I wait it.

Also below is remained task.

• Positions that be stored in database should be multiplyed by scale_factor

Release Notes:

• N/A

[JunkuiZhang]

Edit: Sorry, I misread that. I'm not sure if the current issues related to the scale factor are on the blade side or if they are implementation issues within the Windows gpui platform.

[kazatsuyu]

Probably blade requires the number of physical pixels, so in HiDpi mode, we should just use the value notified by Windows.

There seems to be differences between macOS and Windows in the effect of the scale factor on the size of the window, so there needs to be some changes.

[kazatsuyu]

In second thought, the values to be stored in the database can remain the same. And apply display scale factor on create window.
So I have to wait #9360 too

[kazatsuyu]

https://learn.microsoft.com/en-us/windows/win32/api/shellscalingapi/nf-shellscalingapi-getdpiformonitor#remarks
Apparently it is better to use GetDpiForWindow instead of checking the dpi of the monitor, so it would be better to create the window and then use SetWindowPos to move it.

[kazatsuyu]

Close because of #9449 #9456 is merged