[Merge] lp:~lanoxx/indicator-applet/fix-duplicate-icons into lp:indicator-applet

[Sebastian Geiger]

Sebastian Geiger has proposed merging lp:~lanoxx/indicator-applet/fix-duplicate-icons into lp:indicator-applet.

Requested reviews:
  Dmitry Shachnev (mitya57)

For more details, see:
https://code.launchpad.net/~lanoxx/indicator-applet/fix-duplicate-icons/+merge/390344

This fixes a bug that causes duplicate icons in the indicator-applet. To reproduce the bug, perform the following steps:

1. Start an application which registers a menu item in the indicator applet.
2. Close that application again. Internally the item will be hidden.
3. Move the panel around on the screen to a different edge of the screen.

The result is, that the item will be visible again.

This change fixes the problem by destroying the widget and removing it from the hash table.
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