Autocompletion by mouse in SDL text block causes syntax error warning

Selecting from autocomplete options using the mouse causes a syntax error warning. Selecting from the same list using the keyboard cursors and the return key does not cause the same warning.

1. Create a SDL function
2. Create a text block
3. Start typing a declaration. The autocompletion list will pop up when you are typing the ASN.1 type name.
4. Select the type you want by double-clicking on it.