Bug 407293

SUMMARY

Bug #350878 previously dealt with the remote input plugin, and at the time the ability to tweak the mouse-tracking responsiveness was added in the form of the plugin's "Set touchpad sensitivity" and "Set pointer acceleration" preferences. 

While those work great for tuning pointer movement, it has no effect whatsoever on two-finger scrolling speed, which remains uncomfortably fast and difficult to use with any precision.


STEPS TO REPRODUCE
1. Pair an Android phone running KDE Connect to a Linux system, and enable the "Remote input" plugin on both ends.
2. Open the remote input mode on KDE Connect and use one finger to move the Linux mouse pointer around the screen. Note how finger movements translate into pointer motion.
3. Open a browser and load a long (ideally, continuously-scrolling) page — YouTube's default https://youtube.com/ homepage feed works well.
4. Use two fingers to scroll the page vertically. Choose a particular video and attempt to position it at the exact vertical center of the window.
5. Go into the Remote input plugin's preferences, and set: "Set touchpad sensitivity" to "Above Slowest"; "Set pointer acceleration" to "Weakest".
6. Return to the remote input interface and repeat the previous input tests.

OBSERVED RESULT
While pointer motion becomes positively glacial, scrolling response is exactly the same despite the preferences change. In general, scrolling is extremely hyperresponsive, with even small finger movements translating into exaggerated scrolls. Precise positioning of the scroll position is extremely difficult. There is no way to adjust the response curve governing how two-finger swipes are translated into scroll motions.


EXPECTED RESULT
Two-finger input motions would be, or could be configured to be, amplified less when translated into scroll events, allowing for more gradual and precise shifts of the scrollable canvas using scroll gestures.


SOFTWARE/OS VERSIONS
KDE Connect version: 1.12.7 (Bugzilla's Version selector only goes to 1.10)
Linux: Fedora 29 with GNOME Shell 3.30.2 (via GSConnect v23)