qt: Disable echoing if backspace is pressed first.
* qt/pinlineedit.h: New file. * qt/pinlineedit.cpp: New file. * qt/Makefile.am: Add new source files. * qt/pinentrydialog.cpp (PinEntryDialog): New member _got_input; Type of _edit member changed to PinLineEdit. (PinEntryDialog::onBackspace): New slot.
- GnuPG-bug-id: T3428
- Signed-off-by: Damien Goutte-Gattat <dgouttegattat@incenp.org>