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Makes it consistent with the other KCMs

* Implement undo delete feature
* Introduce currentIndex property instead of indexOf() method
* Make GHNS dialog window modal instead of application modal
* Support drag and drop to install themes
* Use InlineMessage for installation error/success notifications

Differential Revision: https://phabricator.kde.org/D12503

The preview code could luckily be left completely untouched.

Differential Revision: https://phabricator.kde.org/D12248

Summary:
This option is only visible in plasmathemeexplorer is installed. This
makes it easy to edit themes, without cluttering the UI of normal users.

Edit button is made similar to the action buttons in the wallpaper
delegate. (though this is copying an existing bug of of using
plasmacomponents where they shouldn't be)

MouseArea got collapsed into the parent Item in the delegate as it makes
for more readable implicit z-ordering to have the button on top.

Test Plan:
Clicked on one, explorer for that theme appeared.
Faked not having theme explorer by temporarily putting a typo in the service name. No buttons showed

Reviewers: #plasma, apol

Reviewed By: apol

Subscribers: jensreuterberg, apol, abetts, ngraham, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D8006

Summary: It's been deprecated since longtime

Reviewers: #plasma, davidedmundson, mart

Reviewed By: #plasma, davidedmundson, mart

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D4045

Summary:
remove the timer that selects the index at startup
that caused flickering and things moving around since
index 0 got selected, then moved to the correct one only after a while.

Test Plan:
correct theme gets highlighed at startup
probably i'll port l&f kcm currentSelectedIndex property to indexOf
invokable as well.

Reviewers: #plasma, davidedmundson

Reviewed By: #plasma, davidedmundson

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D3533

also, properly deleting the dialog
is the only way it correctly saves the cache of what's installed

also, properly deleting the dialog
is the only way it correctly saves the cache of what's installed

KNS3::dialog emits accepted, not finished

KNS3::dialog emits accepted, not finished

CCMAIL: lueck@hube-lueck.de

Differential Revision: https://phabricator.kde.org/D1113