Notebook: Find across cells (content based)

[rebornix]

The notebook rendering is virtualized, thus when we do search and replace in a notebook, we need to operate on the the underlining text model. The text model behind a notebook document is an array of text or ITextModel:

- text
- text
- `ITextModel`, resolved from text when the cell is rendered in the view 
- text

When Find/Replace starts, we will run search on every cell. To leverage the existing search functionality in Monaco Editor, the whole process will fall into following steps:

• ICell converts text sources to PieceTreeTextBufferFactory
  • If a cell is not visible, we will create a PieceTreeTextBuffer from the buffer factory, run query on the buffer
  • If a cell is visible and there is already a text model created for it (which is created from the same buffer factory, thus they share the same immutable data structure for content, memory saved 📝 ). We run query directly on text model.
• There will be a managed find controller for each notebook editor, which will
  • manage the states of find matches, active match, etc
  • push decorations to monaco editors
• Notebook Editor will be responsible to reveal the cell which has the active match into view
  • If there is folding/virtualization in Monaco Editor, it needs to reveal both the cell and the line in the nested editor