[Bug 1690517] Re: Cannot add files/folders to panel by dragging

[Vlad Orlov]

[Impact]

Due to regression in mate-panel 1.18, it's impossible
to use file/folder launchers on the panel. They will
fail to load right after adding them to the panel.

The fix for this issue is provided in the debdiff
attached to the report.

After MATE 1.18 had been released, it turned out that
a lot of users rely on file/folder launchers in their
daily mate-panel use. Some users even moved to other
desktop environments due to this feature being broken.
So it would be nice to backport the fix to Artful.

[Test Case]

To reproduce the issue, just open file manager (I use
Caja, the default one in MATE) and drag some folder
to mate-panel. A new launcher pointing to that folder
will be created, but it will fail to load, so it won't
appear on the panel.

[Regression Potential]

When I was fixing the issue, I had to revert a lot of
code changes due to some inter-dependencies in these
parts of code. There can be some regression potential
in the following panel features:

- running other types of launchers, besides file/folder
  ones
- using launcher edit dialog
- using desktop actions in the right-click menu of some
  launchers (e.g. firefox, thunderbird, hexchat)

That said, all these features had been tested upstream
before merging the fix. Won't hurt to test them more,
of course. :)

[Other Info]

The fix would be useful in Zesty as well, as mate-panel
1.18.x there has the same bug. But I also have some more
fixes for mate-panel in Zesty, and it seems to me they
better go in the same SRU. In this case, the debdiff for
Zesty should contain the patches for several bug reports
instead of only one. I'm still wondering how to properly
make such an SRU. For reference, these other reports are
bug 1675888, bug 1676840 and bug 1695648.

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https://bugs.launchpad.net/bugs/1690517

Title:
  Cannot add files/folders to panel by dragging

Status in mate-panel package in Ubuntu:
  Confirmed

Bug description:
  To reproduce:
  1. Create an empty file named "empty" on the desktop.
  2. Drag it to the top panel.

  Expected:
  Icon to show up in panel.

  Results:
  Icon does not show up in panel.
  However, ~/.config/mate/panel2.d/default/launchers/empty.desktop is created.

  Tested on:
  ubuntu-mate-17.04-desktop-amd64.iso DVD live session: bug occurs
  ubuntu-mate-16.10-desktop-i386.iso DVD live session: bug does not occur (behaves as expected)

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