fix may be applied to 5.9 branch

In D4879#91745, @mart wrote:

In D4879#91664, @xuetianweng wrote:

(If not, ship this. it seems fine)

Label0 is also used elsewhere. We could add another value to engine though, not sure if worth it.

it's used in the job delegate and as an error message when the transfer fails. maybe having the simple file name is ok in both cases?

In D4879#91642, @davidedmundson wrote:

Label0 comes from the dataengine
We have some nice C++ methods to get a filename from a URL, can we do it there?

(If not, ship this. it seems fine)

In D3829#72924, @graesslin wrote:

I would say the overall problem is that this here still uses an XLib event queue. But Qt uses an xcb connection. I would say this needs a porting away from the XLib code and use Qt's XCB connection and event handling.

In D3829#71988, @graesslin wrote:

In D3829#71877, @xuetianweng wrote:

In D3829#71714, @graesslin wrote:

Could you explain the relationship to global shortcuts? That sounds to me like a bug which needs to be fixed in kglobalaccel

I don't really sure about this. So basically XlibNotifications uses XISelectEvent to monitor certain event. And strangely, the event is not received only if it is triggered by global hotkey.

Which "event"?

search XIPropertyEvent in xlibnotifications.cpp

In D3829#71724, @knambiar wrote:

Might this change fix this issue? https://bugs.kde.org/show_bug.cgi?id=370588

In D3829#71714, @graesslin wrote:

Could you explain the relationship to global shortcuts? That sounds to me like a bug which needs to be fixed in kglobalaccel

Update flickr api key and wiki potd url

add missing change in CMakeLists.txt

change it against master

also apply opacity to kcm's slider

In D2000#36954, @drosca wrote:

The same is in applet, disabled slider is greyed out. And Jens has a point here, it would be better if we come up with a different way to visualize muted stream without changing opacity of sliders (if we want to make them interactive when muted).

also do the same thing to kcm's slider

tested on my desktop.