Simplify logout greeter UI when invoked with a specific option
Right now the logout greeter always shows all available power/session actions (except for Lock, for some reason) regardless of how it was invoked, plus a cancel button and an OK button.
As a result, though it is essentially a confirmation screen, it offers the user options to change their mind after the fact and perform a different action from the one they started with, including those like Sleep and Hibernate that don't exit the session at all.
This isn't ideal as it presents a somewhat strange and cluttered UI to the user, full of options that are unlikely to be used.
To improve the situation, when the dialog is invoked with a specific option, now we only show that option plus a cancel button.
When the dialog is not invoked with any option, (e.g. from the off-by-default "Leave" item in the desktop context menu, or the Ctrl+Alt+Delete global shortcut), all options are still shown, with "Shut Down" pre-selected--as was the prior intention, but it wasn't working. This required some re-plumbing as the dialog wasn't previously designed to support this kind of dual-mode operation. The greeter's windowed test mode is also updated to always show all available options.
BUG: 478022 FIXED-IN: 6.1
| Clicking "Shut Down", before | Clicking Shut Down", after |
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