Increase the reference count of this, and possibly remove the floating reference, if this has a floating reference.
In other words, if the object is floating, then this call "assumes ownership" of the floating reference, converting it to a normal reference by clearing the floating flag while leaving the reference count unchanged. If the object is not floating, then this call adds a new normal reference increasing the reference count by one.
Since GLib 2.56, the type of this will be propagated to the return type under the same conditions as for @ref.
| this |
a Object |
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this |