Created attachment 165024 [details]
Screen recording

Today's Plasma 6 Wayland git master.

When a screen is using a fractional scale factor, clicking and dragging on an of its windows makes the windows visibly blurry until the drag is completed. It happens even if you click-and-hold on the window's titlebar and don't drag it anywhere. Screen recording attached.

The DPI of the screen determines how noticeable this is. With a 1080p screen at 110% or 125% scale, the effect is extremely noticeable. With a 4k screen at 225% scale, the effect is almost imperceptible--though still clearly happening if you look closely.

ADDITIONAL INFORMATION
The issues does not happen with integer scale factors such as 100% and 200%.

Fascinatingly, while taking a screen recording, the issue only happens when the window is being actively dragged; it stops reproducing in the simple case where the titlebar is clicked-and-held but the window isn't actually moved.