When double-clicking a keyword that isn't followed by a space in an editor, the keyword is selected, but the cursor automatically moves to the end of the word:

When you then ask for context help with F1, no documentation will be shown. Instead, it will try to fetch documentation for whatever punctation characters are after the keyword:

Workaround is to move the cursor back one character, so that it is inside the keyword. Anyhow, it would be great if Qt Creator could handle this by default.