[Octave-bug-tracker] [bug #42490] helpdlg does not return a proper graphics handle

[Pantxo Diribarne]

Follow-up Comment #15, bug #42490 (project octave):

Actually, I see that the GUI's resource_manager already has what we need.
resource_manager::icon(icon_name) returns a QIcon for a set of named icons
(IIUC named according to the freedesktop naming scheme) and fallback to Tango
icons if the current theme does not provide the named icon (such as on
Windows). We should probably use this.

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