Fix completions when writing spread expression

Fixes #29234

Author: sheetalkamat

src/services/completions.ts

@@ -703,6 +703,14 @@ namespace ts.Completions {
                     case SyntaxKind.PropertyAccessExpression:
                         propertyAccessToConvert = parent as PropertyAccessExpression;
                         node = propertyAccessToConvert.expression;
+                        if (node.end === contextToken.pos &&
+                            isCallExpression(node) &&
+                            node.getChildCount(sourceFile) &&
+                            last(node.getChildren(sourceFile)).kind !== SyntaxKind.CloseParenToken) {
+                            // This is likely dot from incorrectly parsed call expression and user is starting to write spread
+                            // eg: Math.min(./**/)
+                            return undefined;
+                        }
                         break;
                     case SyntaxKind.QualifiedName:
                         node = (parent as QualifiedName).left;

tests/cases/fourslash/completionsWritingSpreadArgument.ts

@@ -0,0 +1,12 @@
+/// <reference path='fourslash.ts'/>
+
+////
+//// const [] = [Math.min(./*marker*/)]
+////
+
+goTo.marker("marker");
+verify.completions({ exact: undefined });
+edit.insert(".");
+verify.completions({ exact: undefined });
+edit.insert(".");
+verify.completions({ exact: completion.globals });