Intermittent bug in Touchpad One-Finger Scrolling with High-DPI display scaling

This one is quite strange (since it does not happen all the time) but very annoying - on my T420s (with 1600x900 screen) I am using 150% DPI scaling in Windows7 (Pro x64). Ultranav driver is 16.2.5.0.
I am using the preinstalled Chrome browser in a rather default configuration - and by default that program declares itself not High-DPI-aware and gets scaled up by desktop composition - something that can be changed in the properties from the compatibility tab, but which I keep like that since there are sites that look better this way!
Long story short - touchpad scrolling fails to work in more than 50% of the cases in that specific Chrome setup in a way that strongly suggests it is a bug where the touchpad scrolling program fails to account for the fact that Chrome runs "scaled-up" - if Chrome is maximized and the mouse is positioned in the top half AND left-half of the screen scrolling works as expected, HOWEVER when the mouse pointer is positioned (still 100% over the Chrome window) towards the right/bottom extremes scrolling fails and the Ultranav driver seems to send the scrolling messages to some other window than Chrome! (since it seems to fail to take into account the 150% scaling - so it gets wrong values with GetWindowRect and should probably use instead stuff like DwmGetWindowAttribute(hWnd, DWMWA_EXTENDED_FRAME_BOUNDS...))!
Steps to repeat the bug:
- Windows 7 machine, large-resolution screen with Custom DPI text size set to 150% and the older XP-style scaling disable (which enables the new DWM scaling)
- Chrome browser in default mode (which will use scaling); to repeat things easily the window should be maximized and the URL should be set to some long page on which scrolling can be performed
- scrolling should be enabled in Touchpad settings (I do not normally use ChiraMotion, but I do not think it makes a difference)
- mouse pointer should be positioned in the right-most 10% of the window and Touchpad One-Finger Scrolling should be attempted;
- in many/most cases the scrolling messages are sent to some other window beneath Chrome (but NOT always, so it seems there might be another factor in play)
- it is interesting that the different TrackPoint scrolling seems to work even in those conditions.

You won't get a response from Adobe in these user-to-user forums but you will be heard if you post your frustration via the official bug report form:
https://www.adobe.com/cfusion/mmform/index.cfm?name=wishform
Don't expect a formal personal reply though.

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Hi Chris,
Try the following.
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Regards,
DP-K
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****Please mark Accept As Solution if it solves your problem****
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Microsoft MVP - Windows Experience

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Click here to open a link where you can select the country and get the exact contact support number. I’m sure they will be a great help.
Do post us back for further queries.
Best Regards
Shiva Kumar
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Intermittent bug in Touchpad One-Finger Scrolling with High-DPI display scaling

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