Prevent updates to cell text when stauts of cell has changed

news/2 Fixes/7844.md

@@ -0,0 +1 @@
+Prevent updates to the cell text when cell execution of the same cell has commenced or completed.

src/datascience-ui/interactive-common/mainStateController.ts

@@ -1112,10 +1112,25 @@ export class MainStateController implements IMessageHandler {
             // we won't actually update.
             const newVMs = [...this.pendingState.cellVMs];
 
+            // Live share has been disabled for now, see https://github.com/microsoft/vscode-python/issues/7972
             // Check to see if our code still matches for the cell (in liveshare it might be updated from the other side)
-            if (concatMultilineString(this.pendingState.cellVMs[index].cell.data.source) !== concatMultilineString(cell.data.source)) {
-                const newText = extractInputText(cell, getSettings());
-                newVMs[index] = { ...newVMs[index], cell: cell, inputBlockText: newText };
+            // if (concatMultilineString(this.pendingState.cellVMs[index].cell.data.source) !== concatMultilineString(cell.data.source)) {
+
+            // If cell state changes, then update just the state and the cell data (excluding source).
+            // Prevent updates to the source, as its possible we have recieved a response for a cell execution
+            // and the user has updated the cell text since then.
+            if (this.pendingState.cellVMs[index].cell.state !== cell.state) {
+                newVMs[index] = {
+                                    ...newVMs[index],
+                                    cell: {
+                                        ...newVMs[index].cell,
+                                        state: cell.state,
+                                        data: {
+                                            ...cell.data,
+                                            source: newVMs[index].cell.data.source
+                                        }
+                                    }
+                                };
             } else {
                 newVMs[index] = { ...newVMs[index], cell: cell };
             }