fix(tui): make single-line paste atomic to avoid @ autocomplete lag

closes #1812

packages/tui/CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - Fixed TUI width calculation for regional indicator symbols (e.g. partial flag sequences like `🇨` during streaming) to prevent wrap drift and stale character artifacts in differential rendering.
 - Fixed Kitty CSI-u handling to ignore unsupported modifiers so modifier-only events do not insert stray printable characters ([#1807](https://github.com/badlogic/pi-mono/issues/1807))
+- Fixed single-line paste performance by inserting pasted text atomically instead of character-by-character, preventing repeated `@` autocomplete scans during paste ([#1812](https://github.com/badlogic/pi-mono/issues/1812))
 
 ## [0.55.4] - 2026-03-02
 

packages/tui/src/components/editor.ts

@@ -1029,10 +1029,8 @@ export class Editor implements Component, Focusable {
 		}
 
 		if (pastedLines.length === 1) {
-			// Single line - insert character by character to trigger autocomplete
+			// Single line - insert atomically (do not trigger autocomplete during paste)
-			for (const char of filteredText) {
+			this.insertTextAtCursorInternal(filteredText);
-				this.insertCharacter(char, true);
-			}
 			return;
 		}
 

packages/tui/test/editor.test.ts

@@ -1496,6 +1496,26 @@ describe("Editor component", () => {
 			assert.strictEqual(editor.getText(), "hello| world");
 		});
 
+		it("does not trigger autocomplete during single-line paste", () => {
+			const editor = new Editor(createTestTUI(), defaultEditorTheme);
+			let suggestionCalls = 0;
+
+			const mockProvider: AutocompleteProvider = {
+				getSuggestions: () => {
+					suggestionCalls += 1;
+					return null;
+				},
+				applyCompletion,
+			};
+
+			editor.setAutocompleteProvider(mockProvider);
+			editor.handleInput("\x1b[200~look at @node_modules/react/index.js please\x1b[201~");
+
+			assert.strictEqual(editor.getText(), "look at @node_modules/react/index.js please");
+			assert.strictEqual(suggestionCalls, 0);
+			assert.strictEqual(editor.isShowingAutocomplete(), false);
+		});
+
 		it("undoes multi-line paste atomically", () => {
 			const editor = new Editor(createTestTUI(), defaultEditorTheme);