[Bug 1781654] [NEW] No way of displaying a tooltip in fallback mode

[Guido Berhoerster]

Public bug reported:

Current status notifier/application indicator implementations such as
KDE Plasma or the Xfce Status Notifier Plugin display the indicators
"title" and "icon-desc" or "attention-icon-desc" properties in a
tooltip. In fallback mode, i.e. when the icon is a tray icon, does not
show a tooltip and neither provides an API to make use of the tooltip
functionality of the GtkStatusIcon.

This is specifically a problem for my project package-update-indicator
which notifies of available package updates with an icon. If users miss
the associated notification or do not use a notification daemon it is
rather confusing without a tooltip providing the name of the indicator
it belongs to as well as an brief explanation like "Updates available".

I've created a patch which replicates the behavior of KDE Plasma or the
Xfce Status Notifier Plugin in fallback mode by displaying a tooltip
with the contents of the "title" and "icon-desc" or "attention-icon-
desc".

** Affects: libappindicator (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1781654

Title:
  No way of displaying a tooltip in fallback mode

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