Fix clipboard buffering

Author: Splines

src/manimShell.ts

@@ -107,8 +107,6 @@ export class ManimShell {
             return vscode.window.showWarningMessage("Manim is currently starting. Please wait a moment.");
         }
 
-        const clipboardBuffer = await vscode.env.clipboard.readText();
-
         this.lockDuringStartup = true;
         const shell = await this.retrieveOrInitActiveShell(startLine);
         this.lockDuringStartup = false;
@@ -120,8 +118,6 @@ export class ManimShell {
                 this.eventEmitter.once(ManimShellEvent.IPYTHON_CELL_FINISHED, resolve);
             });
         }
-
-        await vscode.env.clipboard.writeText(clipboardBuffer);
     }
 
     /**

src/previewCode.ts

@@ -47,7 +47,7 @@ export async function previewCode(code: string, startLine: number): Promise<void
         const clipboardBuffer = await vscode.env.clipboard.readText();
         await vscode.env.clipboard.writeText(code);
 
-        ManimShell.instance.executeCommand(PREVIEW_COMMAND, startLine);
+        await ManimShell.instance.executeCommand(PREVIEW_COMMAND, startLine);
 
         // Restore original clipboard content
         const timeout = vscode.workspace.getConfiguration("manim-notebook").clipboardTimeout;