Cursor position after adding preset in sequence mode causes an incorrect sequence formation

[Zhirnoff]

Description:
When adding an RNA preset (e.g., "AUCAU") in Macro mode, the cursor is incorrectly placed between the first nucleotide (e.g., "A") and the "p" (phosphate group). As a result, subsequent additions to the chain are misplaced, causing the RNA sequence to break and leading to an incorrect sequence structure. Ideally, the cursor should always move to the end of the chain after adding a preset.

Steps to Reproduce

1. Open Ketcher in Macro mode -> Sequence mode and navigate to the RNA tab.
2. Start clicking one by one on presets A, U, C, A, U
3. Observe the cursor position after adding the first nucleotide.
4. Continue adding presets and observe the chain formation.

Actual behavior
After clicking the first preset, the cursor is placed between the nucleotide (e.g., "A") and the "p" (phosphate group). This placement results in chain breaks and incorrect sequence formation when adding subsequent presets.

Expected behavior
After clicking a preset, the cursor should be positioned at the end of the chain, ensuring that all subsequent additions are appended correctly to form a continuous sequence.

Video

2025-01-14_15h07_26.mp4

Desktop:

• OS: Windows 11
• Browser Chrome
• Version 131.0.6778.205 (Official Build) (64-bit)

Ketcher version
[Version 3.0.0-rc.1]
Indigo version
[Version 1.28.0-rc.1]

#188769167

[Zhirnoff]

Tested. Bug fixed.

2025-02-11_19h12_41.mp4

Desktop:

• OS: Windows 11
• Browser Chrome
• Version 131.0.6778.205 (Official Build) (64-bit)

Ketcher version
[Version 3.0.0-rc.8]
Indigo version
[Version 1.28.0-rc.3]