Notebook Performance Improvements to Cell Editing/Output Changes/Execution Count Changes (#6867)

* edit perf

* Save multiline source in notebooks

* More merges

* Single, multi line works needs work

* Works with single + multi and recomputes active

* Actual perf improvements this time

* code cleanup

* Calculating output position on the fly

* Hmm can we use brackets to make this simpler?

* monday progress

* output working. lots of improvements.

* First tests working

* 10 tests now, fixed bugs

* Cleanup, add output test

* More fixes

* Need to still fix execution count bug

* Tests pass, added comments

* Cleanup

* PR comments round 1

* Deal with merge issues from master, layering

* Deleting duplicate file

* More PR Comments

* PR Comments

src/sql/workbench/parts/notebook/browser/cellViews/code.component.ts

@@ -221,6 +221,7 @@ export class CodeComponent extends AngularDisposable implements OnInit, OnChange
 		this._register(this._editorInput);
 		this._register(this._editorModel.onDidChangeContent(e => {
 			this._editor.setHeightToScrollHeight();
+			this.cellModel.modelContentChangedEvent = e;
 			this.cellModel.source = this._editorModel.getValue();
 			this.onContentChanged.emit();
 			this.checkForLanguageMagics();

src/sql/workbench/parts/notebook/browser/cellViews/codeCell.component.ts

@@ -30,7 +30,7 @@ export class CodeCellComponent extends CellView implements OnInit, OnChanges {
 	@HostListener('document:keydown.escape', ['$event'])
 	handleKeyboardEvent() {
 		this.cellModel.active = false;
-		this._model.activeCell = undefined;
+		this._model.updateActiveCell(undefined);
 	}
 
 	private _model: NotebookModel;