Pastes the contents of a clipboard.
If override_location is null, the pasted text will be inserted at the cursor position, or
the buffer selection will be replaced if the selection is non-empty.
Note: pasting is asynchronous, that is, we’ll ask for the paste data and return, and at some point later after the main loop runs, the paste data will be inserted.
| this |
a `GtkTextBuffer` |
| clipboard |
the `GdkClipboard` to paste from |
| override_location |
location to insert pasted text |
| default_editable |
whether the buffer is editable by default |