Fixes #46440: Distribute multiline paste to multicursors

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

@@ -18,6 +18,7 @@ import { IndentAction, EnterAction } from 'vs/editor/common/modes/languageConfig
 import { SurroundSelectionCommand } from 'vs/editor/common/commands/surroundSelectionCommand';
 import { IElectricAction } from 'vs/editor/common/modes/supports/electricCharacter';
 import { getMapForWordSeparators, WordCharacterClass } from 'vs/editor/common/controller/wordCharacterClassifier';
+import { CharCode } from 'vs/base/common/charCode';
 
 export class TypeOperations {
 
@@ -123,6 +124,15 @@ export class TypeOperations {
 			return multicursorText;
 		}
 
+		// Remove trailing \n if present
+		if (text.charCodeAt(text.length - 1) === CharCode.LineFeed) {
+			text = text.substr(0, text.length - 1);
+		}
+		let lines = text.split(/\r\n|\r|\n/);
+		if (lines.length === selections.length) {
+			return lines;
+		}
+
 		return null;
 	}
 

src/vs/editor/test/browser/controller/cursor.test.ts

@@ -1550,6 +1550,54 @@ suite('Editor Controller - Regression tests', () => {
 		});
 	});
 
+	test('issue #46440: (1) Pasting a multi-line selection pastes entire selection into every insertion point', () => {
+		usingCursor({
+			text: [
+				'line1',
+				'line2',
+				'line3'
+			],
+		}, (model, cursor) => {
+			cursor.setSelections('test', [new Selection(1, 1, 1, 1), new Selection(2, 1, 2, 1), new Selection(3, 1, 3, 1)]);
+
+			cursorCommand(cursor, H.Paste, {
+				text: 'a\nb\nc',
+				pasteOnNewLine: false,
+				multicursorText: null
+			});
+
+			assert.equal(model.getValue(), [
+				'aline1',
+				'bline2',
+				'cline3'
+			].join('\n'));
+		});
+	});
+
+	test('issue #46440: (2) Pasting a multi-line selection pastes entire selection into every insertion point', () => {
+		usingCursor({
+			text: [
+				'line1',
+				'line2',
+				'line3'
+			],
+		}, (model, cursor) => {
+			cursor.setSelections('test', [new Selection(1, 1, 1, 1), new Selection(2, 1, 2, 1), new Selection(3, 1, 3, 1)]);
+
+			cursorCommand(cursor, H.Paste, {
+				text: 'a\nb\nc\n',
+				pasteOnNewLine: false,
+				multicursorText: null
+			});
+
+			assert.equal(model.getValue(), [
+				'aline1',
+				'bline2',
+				'cline3'
+			].join('\n'));
+		});
+	});
+
 	test('issue #3071: Investigate why undo stack gets corrupted', () => {
 		let model = TextModel.createFromString(
 			[