[Bug 1805024] [NEW] Ctrl+Scroll zoom with touchpad in Dolphin is erratic

[Brandon Bell]

Public bug reported:

Ubuntu 18.10 Cosmic (with kubuntu-desktop), Dolphin (4:18.04.3-0ubuntu2)
on a Dell Latiude 7490 using the xserver-xorg-input-synaptics driver.

Using a Ctrl+Scroll with a mouse to zoom works normally, but doing the
same with a touchpad (configured for edge scrolling or two-finger
scrolling) appears to follow different rules which causes it to not work
properly. More specifically, the zoom doesn't seem to activate unless
the scroll speed is excessively fast.

Scrolling, itself, works fine everywhere else in both edge- and two-
finger- mode. Ctrl+Scroll zooming works fine in all other programs
(except Chrome where they've stupidly decided to disable it and require
keyboard Ctrl-/+).

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: dolphin 4:18.04.3-0ubuntu2
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
Uname: Linux 4.18.0-11-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Nov 24 21:26:56 2018
InstallationDate: Installed on 2016-01-31 (1028 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: dolphin
UpgradeStatus: Upgraded to cosmic on 2018-11-20 (4 days ago)

** Affects: dolphin (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug cosmic

** Attachment added: "XInput list"
   https://bugs.launchpad.net/bugs/1805024/+attachment/5216178/+files/xinput.txt

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Title:
  Ctrl+Scroll zoom with touchpad in Dolphin is erratic

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