Review Request 124698: KPasswordDialog: allow the user to show the password

[Elvis Angelaccio]

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https://git.reviewboard.kde.org/r/124698/
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Review request for KDE Frameworks, KDE Usability and Christoph Feck.


Bugs: 224686
    https://bugs.kde.org/show_bug.cgi?id=224686


Repository: kwidgetsaddons


Description
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Starting from Qt 5.2, adding a trailing QAction to a QLineEdit is fairly trivial. This patch implements such an action in order to allow a user to show the password being typed. The action is only available if no password is given to the dialog as preset.

About the icon: for now I've used `games-hint` from Breeze. Let me know whether there is a more relevant icon already available. If not, we can either request it or create a symlink for this one, e.g. `password-hint` or similar.

About the last screenshot: the greyed icon is due to Qt bug [39660](https://bugreports.qt.io/browse/QTBUG-39660). Once fixed upstream (Qt 5.5?), the action will be properly hidden and there will be no icon greyed out.


Diffs
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  src/kpassworddialog.h 9de2724640f483d5ab1134510fb84e1245814d90 
  src/kpassworddialog.cpp 3d348964b4c44d26c44856fc08c199007a195aca 

Diff: https://git.reviewboard.kde.org/r/124698/diff/


Testing
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* Create a default KPasswordDialog. The new action is shown as soon as a password is being typed. The action is no more available as soon as the line edit is cleared.
* Create a default KPasswordDialog, call `setPassword()` with a non-empty password and then show the dialog. The action is not available.


File Attachments
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kpassworddialog1.png
  https://git.reviewboard.kde.org/media/uploaded/files/2015/08/11/8e7e0262-c185-42a3-a713-abea97619989__kpassworddialog1.png
kpassworddialog2.png
  https://git.reviewboard.kde.org/media/uploaded/files/2015/08/11/90f1cbf4-952d-498f-b2a6-27d52a1f650f__kpassworddialog2.png
kpassworddialog3.png
  https://git.reviewboard.kde.org/media/uploaded/files/2015/08/11/b4779acb-31b1-4950-87a4-6e65b5de16c6__kpassworddialog3.png


Thanks,

Elvis Angelaccio

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