Function stb_textedit_sortselection

tutorials/common/imgui/imstb_textedit.h:617–624

canoncialize the selection so start <= end

// canoncialize the selection so start <= end
static void stb_textedit_sortselection(STB_TexteditState *state)
{
   if (state->select_end < state->select_start) {
      int temp = state->select_end;
      state->select_end = state->select_start;
      state->select_start = temp;
   }
}

// move cursor to first character of selection
static void stb_textedit_move_to_first(STB_TexteditState *state)