In Later versioh of Ot (after 5.9) QCompleter List is not available in UI Automation tool.
Steps to reproduce.
1. Build and run Custom Completer Example from Qt Creator examples library.
2. Run Inspect.exe (Tool from Windows SDK, located in c:\Program Files (x86)\Windows Kits\10\bin
\x64\inspect.exe). This tool allow to inspect UI Automation fields in Windows applications.
in 5.9.5 popup of completer is 'list' and all of list elements are available
in 5.12.4 / 5.14.0 popup of completer is 'pane' and no elements available
Also it was rechecked in the latest 5.14.0 and still popup not discoverable as list.
Attached is the screen recording