Summary:
Currently, when you have the desktop in the Desktop layout, if you drop 10 jpg files into the desktop, it creates 10 menus at the same position.
When you have the desktop in the Folder layout, if you drop 10 jpg files into the desktop, it calls `KIO::setApplicationActions()` 10 times.
What does this improve?
- Do not create KIO::MimetypeJob for each file
- Do not call `DropJob::setApplicationActions()` too many times/ create too many menus for each file.
My idea is that, when you drop files into the desktop:
- If they have the same `mimetype` -> we add actions support this `mimetype`.
- If not -> we only show the action from `KIO::DropJob` and only actions support different `mimetypes` at the same time like `Add icon`...
**Require:** D26484
CCBUG: 415917
Reviewers: #plasma, mart, broulik, #vdg, davidedmundson
Reviewed By: #plasma, davidedmundson
Subscribers: davidedmundson, anthonyfieroni, #plasma, kde-frameworks-devel
Tags: #frameworks
Differential Revision: https://phabricator.kde.org/D26691
f8be3ea710