Allow dragging from View mode to external applications
Summary: This patch adds drag functionality to {nav View} mode. A drag operation is only initiated if dragging wouldn't otherwise do something, e.g. when zoomed and the image is pannable, or the crop tool is active. In order to get a drag pixmap for all cases (videos included), we use a ThumbnailProvider to generate a file preview. However, if the image is modified, we generate a new pixmap using the edited version. Using `MimeTypeUtils::selectionMimeData`, this should mean the drag pixmap always matches the image the receiving application gets. BUG: 386034 FIXED-IN: 18.08.0 {F5781358} Test Plan: Drag from View mode, comparison mode. Try raster, SVG, and video file types, including when the image is modified (cropped or rotated). Panning a zoomed image should still be possible. Drag operation should always get a thumbnail/icon pixmap representing the dropped image. Reviewers: #gwenview, rkflx Reviewed By: #gwenview, rkflx Tags: #gwenview Differential Revision: https://phabricator.kde.org/D11877
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