QLineEdit with auto completion from middle of the text

[Dushyant]

Hi,

I want to use QCompleter with QLineEdit, such that pop up should start not from the time user start giving input, instead it should start when user types a specific character. For e.g. when i type "test" no auto completion or pop up; when I type "test(" auto completion should be enabled(since the special character here is '('.

Any suggestion?