Make sure it will work on next Deepin release

[probonopd]

This is on deepin-15.11-amd64.iso. Make sure it will continue to work well on the next Deepin release.

[probonopd]

Right-click the icons does not show the "Extract", "Update", "Open Containing Folder" actions defined in the desktop file:

[Desktop Entry]
Exec=(...)
Actions=Extract;Update;Show;

[Desktop Action Extract]
Name=Extract to AppDir
Exec=bash -c "cd ~ && '/usr/lib/live/mount/findiso/Applications/GIMP_AppImage-git-2.99.1-20190222-x86_64.AppImage' --appimage-extract && xdg-open ~/squashfs-root"

[Desktop Action Update]
Name=Update
Exec=/usr/lib/live/mount/findiso/Applications/appimaged-223-x86_64.AppImage update "/usr/lib/live/mount/findiso/Applications/GIMP_AppImage-git-2.99.1-20190222-x86_64.AppImage"

[Desktop Action Show]
Name=Open Containing Folder
Exec=xdg-open "/usr/lib/live/mount/findiso/Applications"

[probonopd]

Thumbnail icons are not shown on AppImages despite the icons being in ~/.thumbnails/normal.

Not even the png files in ~/.thumbnails/normal themselves show their own thumbnail:

With Deepin 20 Beta, not even thumbnails for screenshot files are shown:

Maybe Deepin Linux does not support thumbnails yet?

This works on e.g., Xfce:

[probonopd]

Desktop notifications disappear too fast. When I set the timeout to 120000 milliseconds, I expect the notification to stay on the screen for 2 minutes. But it disappears after a couple of seconds on Deepin.

[probonopd]

Desktop notifications seem not to honor the \n newline character. It does work in Xfce:

Note that a new line starts after "235." - this does not seem to work on Deepin.

[probonopd]

With Deepin 20 Beta, these issues are still there:

• Make sure it will work on next Deepin release #11 (comment)
• Make sure it will work on next Deepin release #11 (comment)

I think they can only be solved by Deepin Linux.

cc @shouhuanxiaoji