Changed selection direction definition: (#745)

Regression from #340
Addresses microsoft/TypeScript#32449

Author: BuckAMayzing

baselines/dom.generated.d.ts

@@ -7344,7 +7344,7 @@ interface HTMLInputElement extends HTMLElement {
      * When present, marks an element that can't be submitted without a value.
      */
     required: boolean;
-    selectionDirection: string | null;
+    selectionDirection: "forward" | "backward" | "none" | null;
     /**
      * Gets or sets the end position or offset of a text selection.
      */
@@ -8935,7 +8935,7 @@ interface HTMLTextAreaElement extends HTMLElement {
      * Sets or retrieves the number of horizontal rows contained in the object.
      */
     rows: number;
-    selectionDirection: string;
+    selectionDirection: "forward" | "backward" | "none";
     /**
      * Gets or sets the end position or offset of a text selection.
      */

inputfiles/overridingTypes.json

@@ -1476,6 +1476,10 @@
                             "read-only": 1,
                             "override-type": "HTMLFormElement | null"
                         },
+                        "selectionDirection": {
+                            "name": "selectionDirection",
+                            "override-type": "\"forward\" | \"backward\" | \"none\""
+                        },
                         "valueAsDate": {
                             "name": "valueAsDate",
                             "override-type": "Date | null"
@@ -1668,6 +1672,10 @@
                         "labels": {
                             "name": "labels",
                             "override-type": "NodeListOf<HTMLLabelElement>"
+                        },
+                        "selectionDirection": {
+                            "name": "selectionDirection",
+                            "override-type": "\"forward\" | \"backward\" | \"none\""
                         }
                     }
                 },