Tags · rime/librime

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feat(config): support indexed list insertion (#1081)

Add support for inserting elements at specific positions in config lists
using the syntax "/N+" where N is the insertion index.

Changes:
- Add ParseIndexedAppend() function to parse "/N+" syntax from config keys
- Extend AppendToList() to accept optional insert_pos parameter
- Update IsAppending(), IsMerging(), and StripOperator() to handle indexed insertion
- Add bounds checking for insertion position with error logging
- Support both append and insert operations in EditNode()

Examples:
- "key/0+" inserts at beginning of list
- "key/2+" inserts at index 2
- "key+" continues to append at end (backward compatible)

This enhancement allows more precise control over list element positioning
in RIME configuration files while maintaining backward compatibility.

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Co-authored-by: jimmy54 <jimmy54@126.com>