Fix #24553. We should allow paste content besides the selection.

src/vs/editor/contrib/dnd/browser/dnd.ts

@@ -123,7 +123,11 @@ export class DragAndDropController implements editorCommon.IEditorContribution {
 					}
 				});
 				this._editor.setSelections(newSelections);
-			} else if (!this._dragSelection.containsPosition(newCursorPosition)) {
+			} else if (!this._dragSelection.containsPosition(newCursorPosition) || (
+				mouseEvent.event[DragAndDropController.TRIGGER_MODIFIER] && (
+					this._dragSelection.getEndPosition().equals(newCursorPosition) || this._dragSelection.getStartPosition().equals(newCursorPosition)
+				) // we allow users to paste content beside the selection
+			)) {
 				this._editor.executeCommand(DragAndDropController.ID, new DragAndDropCommand(this._dragSelection, newCursorPosition, mouseEvent.event[DragAndDropController.TRIGGER_MODIFIER]));
 			}
 		}

src/vs/editor/contrib/dnd/common/dragAndDropCommand.ts

@@ -30,7 +30,11 @@ export class DragAndDropCommand implements editorCommon.ICommand {
 		}
 		builder.addEditOperation(new Range(this.targetPosition.lineNumber, this.targetPosition.column, this.targetPosition.lineNumber, this.targetPosition.column), text);
 
-		if (this.selection.containsPosition(this.targetPosition)) {
+		if (this.selection.containsPosition(this.targetPosition) && !(
+			this.copy && (
+				this.selection.getEndPosition().equals(this.targetPosition) || this.selection.getStartPosition().equals(this.targetPosition)
+			) // we allow users to paste content beside the selection
+		)) {
 			this.targetSelection = this.selection;
 			return;
 		}