Notify @context that the context surrounding the cursor has changed. If there's no selection @selection_index is the same as @cursor_index.
text surrounding the insertion point
the length of @text, or -1 if @text is nul-terminated
the byte index of the insertion cursor within @text.
the byte index of the selection cursor within @text.
2.28
See Implementation
Notify @context that the context surrounding the cursor has changed. If there's no selection @selection_index is the same as @cursor_index.