fix54092: return replacement ranges for completions on unclosed strings (#57839)

Co-authored-by: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>

src/services/utilities.ts

@@ -2322,8 +2322,13 @@ export function createTextSpanFromNode(node: Node, sourceFile?: SourceFile, endN
 
 /** @internal */
 export function createTextSpanFromStringLiteralLikeContent(node: StringLiteralLike) {
-    if (node.isUnterminated) return undefined;
-    return createTextSpanFromBounds(node.getStart() + 1, node.getEnd() - 1);
+    let replacementEnd = node.getEnd() - 1;
+    if (node.isUnterminated) {
+        // we return no replacement range only if unterminated string is empty
+        if (node.getStart() === replacementEnd) return undefined;
+        replacementEnd = node.getEnd();
+    }
+    return createTextSpanFromBounds(node.getStart() + 1, replacementEnd);
 }
 
 /** @internal */

tests/cases/fourslash/stringCompletionsUnterminated.ts

@@ -0,0 +1,73 @@
+///<reference path="fourslash.ts" />
+
+// @Filename: file0.ts
+//// const a = { "foo.bar": 1 }
+//// a["[|foo.b/*0*/|]
+
+// @Filename: file1.ts
+//// const a = { "foo.bar": 1 }
+//// a["[|foo.b           /*1*/|]
+
+// @Filename: file2.ts
+//// const a = { "foo.bar": 1 }
+//// a[    "[|foo.b/*2*/|]
+
+// @Filename: file3.ts
+//// const a = { "foo.bar": 1 }
+//// a["[|foo.b/*3*/|]"
+
+// @Filename: file4.ts
+//// const a = { "foo.bar": 1 }
+//// a["[|foo./*4*/b|]
+
+// @Filename: file5.ts
+//// const a = { "foo.bar": 1 }
+//// a['[|foo./*5*/b|]
+
+// @Filename: file6.ts
+//// const a = { "foo.bar": 1 }
+//// a[`[|foo./*6*/b|]
+
+// @Filename: file7.ts
+//// const a = { "foo.bar": 1 }
+//// a["[|foo./*7*/|]
+
+// @Filename: file8.ts
+//// const a = { "foo.bar": 1 }
+//// a["[|foo/*8*/|]
+
+// @Filename: file9.ts
+//// const a = { "foo.bar": 1 }
+//// a["[|foo./*9*/|]"
+
+// @Filename: file10.ts
+//// const a = { "foo.bar": 1 }
+//// a["[|foo/*10*/|]"
+
+// @Filename: empty1.ts
+//// const a = { "foo.bar": 1 }
+//// a[`/*11*/
+
+// @Filename: empty2.ts
+//// const a = { "foo.bar": 1 }
+//// a["/*12*/
+
+// @Filename: empty3.ts
+//// const a = { "foo.bar": 1 }
+//// a['/*13*/
+
+// tests 11-13 should return no replacementSpan
+const markers = test.markers();
+const ranges = test.ranges();
+
+for (let i = 0; i < markers.length; i++) {
+    verify.completions({
+        marker: markers[i],
+        includes: [{
+            "name": "foo.bar",
+            "kind": "property",
+            "kindModifiers": "",
+            "replacementSpan": ranges[i],
+        }],
+    });    
+}