我有TextBox和多行字符串，例如：
var str = "First: q1=42, w2=sometext, q3=false\r\nSecond: some very very very very very111 very very very very long text text.";
TextBox Size.Width小。str。如果我将TextBox.Text粘贴到|First: q1=42, w2=sometext, q3=false | <- that is end of TextBox rectangle
|Second: some very very very very | <-
|very111 very very very very long text| <- text autowrapping to start of textbox area
| text. | <-
：
|First: q1=42, w2=sometext, q3=false | <- that is end of TextBox rectangle
|Second: some very very very very | <- first line normal
| very111 very very very very | <- offset text after wrapping
| long text text. | <- on ("Second: ").Length points
我想要那个：
'\t'至少，const值的偏移量（可能是importObject或3个空格）。