Scroll Sync Do Not Function

[defencedog]

Describe the bug
Scroll Sync icon doesn't function when side by side prevview windows is open

To Reproduce
Steps to reproduce the behavior:
Whether you enable or disable scroll sync icon there is no effect

Expected behavior
When I scroll both source code & preview should scroll in sync

Device

• OS: Win11 x64
• App Version v2.6.11

[PathGao]

Scroll sync was rewritten in #196 (pixel-based sync positions instead of line/ratio), which first shipped in v2.6.12 — released 2026-07-13, after this report was filed against v2.6.11. Could you retest on v2.6.12? If sync works there, this issue can be closed.

[Guardiancelte]

looks like it is working. but sync is not perfect, I cannot share the exact file that I was using so I ask GPT to to give me a test file.

When reaching the end of the file it is quite a few lines off. I had this issue in both stress test (I asked a easier one from GPT as I thought it might be the problem with too many format and tables and charts in the hard one, but actually was in both)

Stress Test Easy.md
Stress Test Hard.md

Another issue which shows a lot more on the hard one, but a little on the easy one as well, is when typing text on left side, both the right and left panel are jumping up and down for every character typed (not even doing return to the line, just typing normal chararcters). Which is highly disturbing.

Otherwise I am actually impressed by the displaying capabilities.