Requests the contents of the clipboard as list of supported targets.
When the list is later received, callback will be called.
The targets parameter to callback will contain the resulting targets if
the request succeeded, or NULL if it failed.
Since 2.4
Requests the contents of the clipboard as list of supported targets. When the list is later received, callback will be called. The targets parameter to callback will contain the resulting targets if the request succeeded, or NULL if it failed. Since 2.4