[Marble-bugs] [marble] [Bug 358094] Regression; Scroll-zoom with touchpads broken in Marble v15.12

[Stefan Bauer via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=358094

--- Comment #4 from Stefan Bauer <stefan-a-bauer at gmx.net> ---
I did some more investigations and would like to share my findings.

First:
I was debugging MarbleDefaultInputHandler::handleWheel() using a mouse and
touchpad. I see a difference in the wheelevt.delta() value: With the mouse, on
scroll "click" results in single a value of exactly +/- 120. With the touchpad,
I get a series of values like 15 15 15 12 8 12 11 8 3 25 11 4. As this values
gets integer-divided first by 3 and then by 5 for discrete maps, I'm expecting
trouble for lower values of wheelevt.delta().

Second:
Using a mouse, I was comparing the height in kilometers of a "discrete" and a
non-discrete map depending on how often I scroll into the globe. I see severe
inconsistencies here, resulting in a different user experience depending on
whether the map is discrete or not. See the attached files for the data.

Do you agree that these values should be identical for both map-types or am I
missing something?

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