Chat attachments: allow picker to choose any file type

tests/test_chat_attachment_picker.py

@@ -0,0 +1,33 @@
+from html.parser import HTMLParser
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+class _InputParser(HTMLParser):
+    def __init__(self):
+        super().__init__()
+        self.inputs = {}
+
+    def handle_starttag(self, tag, attrs):
+        if tag != "input":
+            return
+        attr_map = dict(attrs)
+        input_id = attr_map.get("id")
+        if input_id:
+            self.inputs[input_id] = attr_map
+
+
+def _inputs():
+    parser = _InputParser()
+    parser.feed((ROOT / "static" / "index.html").read_text(encoding="utf-8"))
+    return parser.inputs
+
+
+def test_chat_attachment_picker_allows_any_file_type():
+    file_input = _inputs()["file-input"]
+
+    assert file_input["type"] == "file"
+    assert "multiple" in file_input
+    assert "accept" not in file_input