Fix potential leak of chat editors (microsoft#223438)

Fixes microsoft#213209

I believe that chat editors are potentially being leaked when progressive rendering ends due to `contentParts` being set without also being disposed of

Also fixes the wrong selection potentially being used

Fixes microsoft#217835

Author: mjbvz

src/vs/workbench/contrib/chat/browser/chatListRenderer.ts

@@ -56,7 +56,7 @@ import { ChatFollowups } from 'vs/workbench/contrib/chat/browser/chatFollowups';
 import { ChatMarkdownDecorationsRenderer } from 'vs/workbench/contrib/chat/browser/chatMarkdownDecorationsRenderer';
 import { ChatMarkdownRenderer } from 'vs/workbench/contrib/chat/browser/chatMarkdownRenderer';
 import { ChatEditorOptions } from 'vs/workbench/contrib/chat/browser/chatOptions';
-import { ChatCodeBlockContentProvider } from 'vs/workbench/contrib/chat/browser/codeBlockPart';
+import { ChatCodeBlockContentProvider, CodeBlockPart } from 'vs/workbench/contrib/chat/browser/codeBlockPart';
 import { ChatAgentLocation, IChatAgentMetadata } from 'vs/workbench/contrib/chat/common/chatAgents';
 import { CONTEXT_CHAT_RESPONSE_SUPPORT_ISSUE_REPORTING, CONTEXT_REQUEST, CONTEXT_RESPONSE, CONTEXT_RESPONSE_DETECTED_AGENT_COMMAND, CONTEXT_RESPONSE_FILTERED, CONTEXT_RESPONSE_VOTE } from 'vs/workbench/contrib/chat/common/chatContextKeys';
 import { IChatRequestVariableEntry, IChatTextEditGroup } from 'vs/workbench/contrib/chat/common/chatModel';
@@ -162,7 +162,7 @@ export class ChatListItemRenderer extends Disposable implements ITreeRenderer<Ch
 		return ChatListItemRenderer.ID;
 	}
 
-	editorsInUse() {
+	editorsInUse(): Iterable<CodeBlockPart> {
 		return this._editorPool.inUse();
 	}
 
@@ -488,6 +488,9 @@ export class ChatListItemRenderer extends Disposable implements ITreeRenderer<Ch
 				parts.push(newPart);
 			}
 		});
+		if (templateData.renderedParts) {
+			dispose(templateData.renderedParts);
+		}
 		templateData.renderedParts = parts;
 
 		if (isRequestVM(element) && element.variables.length) {

src/vs/workbench/contrib/chat/browser/chatWidget.ts

@@ -260,8 +260,8 @@ export class ChatWidget extends Disposable implements IChatWidget {
 						inner.setSelection({
 							startLineNumber: input.options.selection.startLineNumber,
 							startColumn: input.options.selection.startColumn,
-							endLineNumber: input.options.selection.startLineNumber ?? input.options.selection.endLineNumber,
-							endColumn: input.options.selection.startColumn ?? input.options.selection.endColumn
+							endLineNumber: input.options.selection.endLineNumber ?? input.options.selection.startLineNumber,
+							endColumn: input.options.selection.endColumn ?? input.options.selection.startColumn
 						});
 					}
 					return inner;
@@ -413,7 +413,7 @@ export class ChatWidget extends Disposable implements IChatWidget {
 							`${isResponseVM(element) && element.renderData ? `_${this.visibleChangeCount}` : ''}` +
 							// Re-render once content references are loaded
 							(isResponseVM(element) ? `_${element.contentReferences.length}` : '') +
-							// Rerender request if we got new content references in the response 
+							// Rerender request if we got new content references in the response
 							// since this may change how we render the corresponding attachments in the request
 							(isRequestVM(element) && element.contentReferences ? `_${element.contentReferences?.length}` : '');
 					},