文本框无法重定位光标，删除中文字符报错

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function UIEditText:getLineInfoAt(x, y)
    -- returns the wrap, line, and byteoffset
    -- of specified line
    local wraps = self.label:getWrap()
    local line = wraps[y] or ""
    local byteoffset = x
--  原代码
--  local line = wraps[self.cursorCoords.y] or ""
--  local byteoffset = utf8.offset(line, self.cursorCoords.x) or 0
    return wraps, line, byteoffset
end


function UIEditText:wedgeLineAt(x, y, xo, yo)
    -- return line info + both parts of line
    -- split by the current position of cursor
    local wraps, line, byteoffset = self:getLineInfo(x, y)
    left = utf8.sub(line,1, byteoffset + xo)
    right = utf8.sub(line,byteoffset + yo, -1)
--  原代码
--  left = line:sub(1, byteoffset + xo)
--  right = line:sub(byteoffset + yo, -1)
    return wraps, line, byteoffset, left, right
end


function UIEditText:insertCharAt(char, x, y)
    local wraps, line, byteoffset, left, right =
      self:wedgeLineAt(x, y, 0, 1)
    local newLine = left..char..right
    if x == 0 then
      newLine = char..left..right
    end
    -- some future wrapping :)
    -- if char ~= '\f' and #newLine % 20 == 0 then
    --     print('inserting f')
    --     self:insertCharAt('\f', x+1, y)
    -- end
    table.remove(wraps, y)
    table.insert(wraps, y, newLine)
    self.label:setText(table.concat(wraps, '\n'))
    self.events:dispatch(UI_TEXT_CHANGE, self.label:getText())
    self:moveCursor(utf8.len(char), 0)
--  原代码
--  self:moveCursor(#char, 0)
end

-------------------------------------
-- (callback)
-- on key down
-------------------------------------
function UIEditText:onKeyDown(key, scancode, isrepeat)
    local wraps, line, byteoffset = self:getLineInfo()
    if key == "backspace" and byteoffset then
        self:backspace()
    elseif key == "return" then
        self:newline()
    elseif key == "tab" then
        self:insertChar('  ')
    elseif key == "up" then
        if self.cursorCoords.y > 1 then
            self:moveCursor(0, -1)
        end
    elseif key == "down" then
        if self.cursorCoords.y < self.rows then
            self:moveCursor(0, 1)
        end
    elseif key == "left" then
        if self.cursorCoords.x > 0 then
            self:moveCursor(-1, 0)
        elseif self.cursorCoords.y > 1 then
            self:moveCursor(#(wraps[self.cursorCoords.y-1] or {}), -1)
        end
    elseif key == "right" then
        if self.cursorCoords.x < utf8.len(line) then
--  原代码
--      if self.cursorCoords.x < #line then
            self:moveCursor(1, 0)
        elseif self.cursorCoords.y < self.rows then
            self:moveCursor(-self.cursorCoords.x, 1)
        end
    end

    self.showCursorDt = 0
    self.showCursor = true
end


function UIEditText:moveCursor(xo, yo)
    self.cursorCoords.y = self.cursorCoords.y + yo
    if xo == 0 then
      local wraps = self.label:getWrap()
      local width = utf8.len(wraps[self.cursorCoords.y])
--  原代码
--    local width = #wraps[self.cursorCoords.y]
      if self.cursorCoords.x > width then
        self.cursorCoords.x = width
      end
    else
      self.cursorCoords.x = self.cursorCoords.x + xo
    end
end

-------------------------------------
-- draw cursor
-------------------------------------
function UIEditText:drawCursor()
    if not self.showCursor then
        return
    end

    local wraps = self.label:getWrap()
    local length = #wraps == 0 and 1 or #wraps
    local chars = utf8.sub((wraps[self.cursorCoords.y] or ""), 1, self.cursorCoords.x)
--  原代码
--  local chars = (wraps[self.cursorCoords.y] or ""):sub(
--    1, self.cursorCoords.x
--  )
    local width = self.label:measureWidth(chars)
    local maxX = self.label:getBoundingBox():getX()
    local maxY = self.label:getBoundingBox():getY()
    maxX = maxX + width + 1
    maxY = maxY + self.cursorCoords.y * self.label:getFont():getHeight()

    local r, g, b, a = love.graphics.getColor()
    local color = self.cursorColor
    love.graphics.setColor(color[1], color[2], color[3], color[4])
    love.graphics.setLineWidth(2)
    love.graphics.line(maxX, maxY, maxX, maxY - self.label:getFont():getHeight())
    love.graphics.setColor(r, g, b, a)
end