Bug 515259

Summary:	Unexpectedly timeline auto vertical scrolls when dragging a clip horizentally
Product:	[Applications] kdenlive	Reporter:	red_Arti <jijiliu35>
Component:	Timeline & Editing	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	REPORTED ---
Severity:	normal
Priority:	NOR
Version First Reported In:	25.12.1
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description red_Arti 2026-01-29 12:46:19 UTC

SUMMARY
When attempting to drag a video clip left or right on the timeline under certain conditions, the timeline unexpectedly scrolls vertically 

STEPS TO REPRODUCE
1. Adjust the height of the timeline area to be shorter so that vertical scrolling is required to view all tracks.
2. Create a subtitle on timeline
3. Scroll the timeline area vertically so that the uppermost tracks (e.g., V2) are out of view, and only lower tracks (e.g., V1 and below) are visible.
4. Click and hold a video clip on V1 and drag it left or right horizontally without moving the mouse vertically.

OBSERVED RESULT
The timeline unexpectedly auto-scrolls upwards (Y-)

EXPECTED RESULT
The timeline should not scroll vertically when dragging a clip horizontally


SOFTWARE/OS VERSIONS
Kdenlive: 25.12.1
Kdenlive: 25.12.1 - rev. 4a9668f
MLT: 7.37.0
KDE  6.21.0
Qt:  6.10.1 
Build ABI: x86_64-little_endian


ADDITIONAL INFORMATION