Improve integration with KWallet
Konqueror fails to save user credentials in many sites for two reasons: - the site sets the autocomplete attribute to off for the fields (I can't understand whether this is an oversight or a conscious choice) - clicking the "login" (or similar) button causes QWebEnginePage::acceptNavigationRequest with a type argument different from NavigationTypeFormSubmitted. Since Konqueror uses that value to decide whether credentials should be saved or not, it doesn't save them. Given this situation, I believe that there's no simple way to automatically detect when credential saving and loading should be applied, so I decided to give the user the ability to manually choose which fields should be saved and to manually save them. In practice, I added three entries to the KWallet popup menu in Konqueror: - one displays a dialog where the user can choose which of the fields in the current page should be saved in KWallet. This allows to override the autocomplete=off HTML attribute - one allows to remove the customization described above - one immediately saves the credentials to KWallet, allowing to work around the NavigationTypeFormSubmitted issue.