Use the V entry as an option when no options in a choice widget

It fixes #19083.

It isn't really a fix but more a workaround (we should correctly implement the
choice widget as a mix of text input+select).

src/core/annotation.js

@@ -3511,6 +3511,18 @@ class ChoiceWidgetAnnotation extends WidgetAnnotation {
       }
     }
 
+    // It's a workaround for the issue #19083.
+    // Normally a choice widget is a mix of a text field and a listbox,
+    // So in the case where the V entry isn't an option we should just set it
+    // as the text field value.
+    if (this.data.options.length === 0 && this.data.fieldValue.length > 0) {
+      // If there are no options, then the field value is the only option.
+      this.data.options = this.data.fieldValue.map(value => ({
+        exportValue: value,
+        displayValue: value,
+      }));
+    }
+
     // Process field flags for the display layer.
     this.data.combo = this.hasFieldFlag(AnnotationFieldFlag.COMBO);
     this.data.multiSelect = this.hasFieldFlag(AnnotationFieldFlag.MULTISELECT);

test/pdfs/.gitignore

@@ -681,3 +681,4 @@
 !issue18894.pdf
 !bug1922766.pdf
 !issue18956.pdf
+!issue19083.pdf

test/test_manifest.json

@@ -10766,5 +10766,14 @@
     "rounds": 1,
     "type": "eq",
     "link": true
+  },
+  {
+    "id": "issue19083",
+    "file": "pdfs/issue19083.pdf",
+    "md5": "2e2aa6c1904c1e6a89a5a6ec95d5ce7e",
+    "rounds": 1,
+    "forms": true,
+    "talos": false,
+    "type": "eq"
   }
 ]