feat: Add comprehensive LSP server notification handling support

[loyalpartner]

Summary

• Implement comprehensive LSP server notification handling system
• Add support for 8 different notification types from language servers
• Maintain backward compatibility with existing diagnostics handling
• Follow Linus-style architecture principles for clean, maintainable code

Changes

• New EnhancedNotificationHandler for unified notification processing
• NotificationRegistrationHandler for dynamic registration from Vim
• Channel-based async forwarding system to convert notifications to VimActions
• Integration with existing LSP client architecture

Resolves #45

Generated with Claude Code

[loyalpartner]

@claude ctrl+p , ctrl+n 选中下一个后 窗口会飘到左边

[loyalpartner]

@claude ctrl+p , ctrl+n 选中下一个后 窗口会飘到左边

@claude

[claude]

Claude finished @loyalpartner's task —— View job

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I'll investigate the completion popup positioning issue where Ctrl+P/Ctrl+N causes the window to drift to the left.

Todo List

• Set up repository and investigate completion popup code
• Identify the root cause of popup positioning issue
• Implement fix for consistent popup positioning
• Test and commit changes

Analysis

I found and fixed the issue! In lsp_bridge.vim:775-784, the completion popup was being recreated on every navigation with Ctrl+P/Ctrl+N. The problem was in the s:create_or_update_completion_popup function:

Root Cause: The popup used 'cursor' for column positioning, but when recreated during navigation, slight cursor position shifts caused the popup to "drift" left.

Solution

Fixed the positioning drift by:

1. Storing initial position: Added s:completion.popup_position to cache the popup's initial cursor position
2. Updating instead of recreating: Modified s:create_or_update_completion_popup to use popup_settext() for navigation, only creating popup once
3. Consistent documentation positioning: Updated the documentation popup to use the same cached position

Key changes in vim/autoload/lsp_bridge.vim:

" Store popup position on first creation
let s:completion.popup_position = {
  \ 'line': cursor_pos[1] + 1,
  \ 'col': cursor_pos[2]
}

" Update content instead of recreating
if s:completion.popup_id != -1
  call popup_settext(s:completion.popup_id, a:lines)
  return
endif

This ensures the popup stays anchored to its original position during Ctrl+P/Ctrl+N navigation.

Changes committed in 3fe97c7 - the completion popup should now maintain its position consistently during navigation. Try using Ctrl+P/Ctrl+N to navigate completions and the window should stay in place! 🎯
| Branch: claude/issue-45-20250823-1617