I had fixed this prior to 5.13 but the patch was never accepted: https://codereview.qt-project.org/c/qt/qtbase/+/188493 https://bugreports.qt.io/browse/QTBUG-58329 https://build.opensuse.org/package/view_file/ home:thiagomacieira:branches:openSUSE:Factory/libqt5-qtbase/0001-HighDpi-Fix- handling-of-the-screen-origin-point.patch?expand=1
The problem is that Qt is adding device-independent pixels to device-dependent ones when calculating the positions of anything outside the first screen and coming up with nonsense. This can be seen from these lines in qtdiag: Geometry: 1920x1080+3200+0 (native: 3840x2160+3200+0) Available: 1920x1080+3200+0 Virtual geometry: 5120x1080+0+0 Available: 5120x1080+0+0 The number 5120 is 1920+3200, but 1920 is a scaled number and 3200 isn't. That means 5120 is a nonsensical result. The end result is that positioning of many things are off. I've filed https://bugreports.qt.io/browse/QTBUG-81695, but I'm reporting here because this issue affects kmail majorly in 5.14 and thus makes it VERY difficult for me to work. Please consider this bug a P0. -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel System Software Products
Screens: 2, High DPI scaling: active # 0 "eDP1" Depth: 24 Primary: yes Manufacturer: Sharp Corporation Model: Serial number: Geometry: 1600x900+0+0 (native: 3200x1800+0+0) Available: 1600x900+0+0 Virtual geometry: 5120x1080+0+0 Available: 5120x1080+0+0 2 virtual siblings Physical size: 290x170 mm Refresh: 59.9818 Hz Power state: 0 Physical DPI: 140.138,134.471 Logical DPI: 108,108 (native: 216.747,216.854) Subpixel_None High DPI scaling factor: 2 DevicePixelRatio: 2 Pixel density: 1 Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0 # 1 "DP1-1" Depth: 24 Primary: no Manufacturer: Dell Inc. Model: DELL P2715Q- Serial number: X24K1693BS8L- Geometry: 1920x1080+3200+0 (native: 3840x2160+3200+0) Available: 1920x1080+3200+0 Virtual geometry: 5120x1080+0+0 Available: 5120x1080+0+0 2 virtual siblings Physical size: 600x340 mm Refresh: 23.976 Hz Power state: 0 Physical DPI: 81.28,80.6824 Logical DPI: 108,108 (native: 216.747,216.854) Subpixel_None High DPI scaling factor: 2 DevicePixelRatio: 2 Pixel density: 1 Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0
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