Markdown scroll sync between preview and src

[guanglinn]

⚠️ This issue respects the following points: ⚠️

• [X] This is a enhancement/feature request. Not a bug or question.
• [X] The topic is not already reported at Issues. (I've searched it).
• [X] Markor is up to date. See Releases for the latest version. Updates are available from F-Droid and GitHub.
• [X] The wanted feature/enhancement is not present in the latest development version (git master). (Please download and try the test version of Markor, named Marder. Don't worry; Markor and Marder appear as completely separate applications. You can install both side-by-side, and Markor's settings are not touched. If your desired feature is present, you don't need to open this issue. The change will be part of the next Markor update.)

Description

This is a feature request.
Hope Markor supports scroll synchronization between markdown preview in view-mode and its source code in edit-mode.

Information

Android version: Android 12 Device: Huawei Nova 8 App Version: 2.12.5 (code 154)

Source

GitHub Releases

Format / File type

Markdown

Additional info / Log

-

[gsantner]

2189 #679 #1070

[guanglinn]

I am sorry for not noticing those closed issues.

[guanglinn]

This is an advanced feature for Markor, but I noticed that Visual Studio Code does well in Markdown scroll sync, the code of this feature is here vscode/extensions/markdown-language-features/preview-src/scroll-sync.ts, and the related issue from VSCode Support to scroll markdown preview with source scrolling.

It may be a very valuable reference for us to analyze its principle and implementation. @gsantner @harshad1

https://github.com/user-attachments/assets/0303b233-d950-497d-a9e9-fbce537cdfe9/

[harshad1]

To this end every node in the markdown html now has a line=# attribute. This should be sufficient to jump when going back and forth if handled well, I think

[gsantner]

Unfortunatley it's though markdown specific and next up people cry out when it is ""broken/unavailable/not works"" for other formats. It's not generic solveable in easy way

[guanglinn]

I think it is feasible on Markor to a certain extent, maybe we can try to implement it on Markdown first.

If we master the implementation of the feature principle in code and it works well, then it could be easily implemented for other formats.