Notebook debt for May

[rebornix]

A brief summary of items we didn't finish in last iteration and issues reported during endgame

• Drag & Drop Improve notebook drag and drop experience #96308
• API refactoring Align API for NotebookEditors and CustomEditors? #95854
• TextBuffer/TextModel (blocker of [WIP] split and join #96156)
  • The idea is every CellTextModel will manage its content in ITextBuffer, which be used as the backing store for TextModel thus every edit in Monaco Editor will be updated in the text buffer immediately. Also we will have a set of TextModel like API to use even when the cell is not attached to an editor yet.
• Renderers
  • acquireVSCodeApi(rendererId) in Notebook Webview Notebook renderer: state persistence #95361
  • development mode API Tell extensions whether they're running in development mode #95926
  • polish hot reloading Exploration of hot reloading of renderers in notebooks w/ Webpack #95908, Rerender cell output in the viewport if the notebook renderer webview reloads #95990
• Working Copy (revert, hot exit)
  • revert
  • hot exit
  • 🔧 register working copy in NotebookTextModel other than NotebookViewModel to avoid duplicated registration Notebook: registers duplicate working copies with same resource #96402
• Language selector
• Undo/redo of notebook only workspace edits should be one operation
• Composite Editor
  • add isCompositeEditor context key
  • add a way to see all editors/uris of a composite editor
• revisit vscode-notebook-scheme for cell, maybe vscode-notebook-cell?

[rebornix]

Please help add items which are not tracked by issues and we can have a good discussion about them tomorrow.