notify_surrounding

Description:

public virtual void notify_surrounding (string text, uint length, uint cursor_index, uint selection_index)

Notify this that the context surrounding the cursor has changed.

If there's no selection selection_index is the same as cursor_index.

this	a InputMethodContext
text	text surrounding the insertion point
length	the length of `text`, or -1 if `text` is nul-terminated
cursor_index	the byte index of the insertion cursor within `text`.
selection_index	the byte index of the selection cursor within `text`.