Inconsistent Zoom Out behavior using CTRL + Mouse Wheel Scroll Down

[TIRTAGT]

Description
Previously, I always use CTRL + Mouse Wheel to quickly zoom in and out of images in Pinta.

But right now after compiling latest from source with pinta-git package on Arch Linux AUR, zoom out behavior is inconsistent, either:

• It zooms out the image just fine
• It scrolls across the entire image height (Y-axis) first before zooming out

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To Reproduce

1. Open Pinta
2. Paste any image that have quite decent height (I just took screenshot of Pinta's README.md, 1455x996 image)

3. Zoom in anywhere on the image using CTRL + Scroll Wheel Up
4. Release CTRL
5. Vertically scroll the image (up/down) a bit using the scroll wheel (avoid scrolling to the vertical edges)
6. Zoom out using CTRL + Scroll Wheel Down
7. The Problem: Pinta tries to vertically scroll down the image before attempting to zoom out

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Additional Info
Here's a video showing the issue (Vertically scrolling the image before zooming out):

2025-10-18.21-38-30.mp4

Here's a video showing the usual behavior (I didn't vertically scroll the image this time):

2025-10-18.21-39-23.mp4

Tried to recompile from source again just in case of a bad compilation, still same issue.

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Version
OS: Arch Linux 6.17.1-zen, KDE Plasma 6.4.5 (X11)
Pinta: 3.1

[VirtualScallop]

I'm new to this software, but having a similar issue
Linux Mint 22.2 (Cinnamon 6.4.8)

[cameronwhite]

I think this can probably be merged with #1027, but you mention that the behaviour seemed different in the latest version of Pinta - which version were you previously using where things behaved differently?

[TIRTAGT]

@cameronwhite I'm not exactly sure which version (the usual case of "Didn't notice until it breaks" + "Let's just wait, probably will be fixed the next month I do system update"), so right now I have no idea at all which version introduces the bug.

But going back through branches, here's what I found:

• release-3.0 (Pinta 3.0.4) - Bug occurred ❌
• release-2.1 (Pinta 2.1.2) - Bug didn't occur ✔️

Going back through releases:

• Pinta 3.0 - Bug occurred ❌
• Pinta 3.0 Beta 1 - Bug occured ❌
• Pinta 2.1.2 - Bug didn't occur ✔️

Unfortunately due to time constraints, I didn't have time to go through random commits between 2.1.2 -> 3.0-beta1.

But if you can pick commits for me to test, just @ me 👍🏻

[TIRTAGT]

Friendly ping (I noticed the info needed label wasn't updated for ~4 days): @cameronwhite

[cameronwhite]

Thanks! There's a good chance it was some change in the GTK4 port for Pinta 3.0, so it's probably not worth tracking down the commit further