set_use_preedit
Description:
Sets whether the IM context should use the preedit string to display feedback.
If use_preedit is false (default is true), then the IM context
may use some other method to display feedback, such as displaying it in a child of the root window.
Parameters:
| this |
a `GtkIMContext` |
| use_preedit |
whether the IM context should use the preedit string. |