[Bug]: Gap appear when scaling/zooming webtoon

[parkerjohn6]

Preflight Checklist

• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

OpenComic Version

1.5.0

Operating System

Windows 11 Home Single Language

Installed via

.exe

Steps to reproduce

1. Open a webtoon.
2. Select webtoon mode (page layout->reading webtoon)
3. Zoom in or out (as long as its width is different from the original width).
   

When zooming in/out in webtoon mode, gaps will appear, the solution I found is pressing F11 twice to reset it and the gap will disappear when zooming out. But this "F11 solution" doesn't always work.

Expected Behavior

Gaps won't appear when scaling in webtoon.

Actual Behavior

Gaps appear when scaling in webtoon.

Error message

No response

Additional Information

No response

Sample file

No response

[parkerjohn6]

https://github.com/user-attachments/assets/177bc061-19f0-48f6-9bfd-ec570e61691f
The gap will also appear or disappear when scrolling (original width).

[ollm]

It seems to be a bug with the version of electron/chromium. I've updated from electron v36.5.0 to v37.0.0 and the problem seems to be fixed 2b98eb3

Build: https://mega.nz/file/nboGHLTC#44aigneaq79_a81Ag0tZRz19oIfGHXGamX4ahEzuWcU

[parkerjohn6]

https://github.com/user-attachments/assets/177bc061-19f0-48f6-9bfd-ec570e61691f The gap will also appear or disappear when scrolling (original width).

After updating with the provided .exe from Mega and clearing the cache, the gap no longer disappears/flickers as it did previously. It now remains visible when scrolling (video below). The gap remains when the webtoon is not at its original width (when zoomed in or out) (vid & img below).
https://github.com/user-attachments/assets/0e41d7c9-28f6-470e-a82d-8a2e9b3dfae8

[ollm]

This is another bug with chromium/electron in transform using scale. To fix this in OpenComic, the zoom function would have to be rewrited so that it does not use transform: scale().

https://issues.chromium.org/issues/401515597
https://issues.chromium.org/issues/40893861
https://issues.chromium.org/issues/40084005

Since this only affects Webtoon mode, my recommendation for now is to avoid using Zoom in this mode, if you want to enlarge or reduce the image you will have to disable the Do not enlarge more than its original size function and adjust the side margin to reduce the image to the desired size (If you need more margin you can increase it from the settings).

Videograbacion.2025-06-23.11.22.28.mp4

[parkerjohn6]

Thanks, this workaround worked!