int ins_wch(const cchar_t *wch);int wins_wch(WINDOW *win, const cchar_t *wch);int mvins_wch(int y, int x, const cchar_t *wch);int mvwins_wch(WINDOW *win, int y, int x, const cchar_t *wch);
These routines, insert the complex character wch with rendition
before the character under the cursor. All characters to the
right of the cursor are moved one space to the right, with the
possibility of the rightmost character on the line being lost.
The insertion operation does not change the cursor position.
If successful, these functions return OK. If not, they return
Functions with a “mv” prefix first perform a cursor movement
using wmove, and return an error if the position is outside the
window, or if the window pointer is null.
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