Screen.Width/Height is sometimes taken from the false screen in multi screen setup.

Qt user reported about screen dimension issue if Qt app is launched from different screen in a multi screen setup. The app could get the dimensions of the screen where the mouse is located. Their screen resolutions are: Primary laptop 1920x1080 and Second monitor 5120x1440. Other setups primary screen resolution is 1920x1080 and secondary monitors screen resolutions are 3840x2160, and 2560x1440.

Qt support tested following:

Three screens
1.1440 x 900 100% scale
2.1680 x 1050 100% scale(Screen is a 4k laptop monitor)
3.1920 x 1080 100% scale

Primary screen is number 2.
Deploying app via Qt Creator from 1. and 3. screen causes mouse cursor to move to screen 2 and it gives correct resolution.
This works correctly.

Screen 1. is made the primary screen with the windows re-login.

App deploy from screen 2 works correctly but the mouse does not move anymore. Correct resolution given 1440 x 900.
App deploy from screen 3 does not move mouse and app appears odd(partly appears on 2.screen left under corner) and gives resolution 1920 x 900 which is wrong.

Screen 3. is primary. No win re-login.
App deployd from screens 1. and 2. does not move the mouse but give correct resolution: 1920 x 1080

Test project attached.