Fix onDidChangeTextEditorSelection firing when the editor is resized (#32197)

* Fix onDiChangeTextEditorSelection firing when the editor is resized

**Bug**
onDidChangeTextEditorSelection is being fired when the editor window is resized

**Fix**
Make sure we do not refire this event if the selection in terms of the model has not changed

Fixes #32092

* Fix null deref

src/vs/editor/common/controller/cursor.ts

@@ -389,7 +389,12 @@ export class Cursor extends viewEvents.ViewEventEmitter implements ICursors {
 		this._emit([new viewEvents.ViewCursorStateChangedEvent(viewSelections, isInEditableRange)]);
 
 		// Only after the view has been notified, let the rest of the world know...
-		this._onDidChange.fire(new CursorStateChangedEvent(selections, source || 'keyboard', reason));
+		if (!oldState
+			|| oldState.cursorState.length !== newState.cursorState.length
+			|| newState.cursorState.some((newCursorState, i) => !newCursorState.modelState.equals(oldState.cursorState[i].modelState))
+		) {
+			this._onDidChange.fire(new CursorStateChangedEvent(selections, source || 'keyboard', reason));
+		}
 
 		return true;
 	}

src/vs/editor/common/controller/cursorCommon.ts

@@ -415,7 +415,7 @@ export class CursorState {
 	}
 
 	public equals(other: CursorState): boolean {
-		return (this.viewState.equals(other.viewState) && this.modelState.equals(other.viewState));
+		return (this.viewState.equals(other.viewState) && this.modelState.equals(other.modelState));
 	}
 }