TextField return wrong .htmlText value for text ending with newline

[ylazy]

import flash.text.TextField;

var text:String = "test\n";
var tf:TextField = new TextField();
    tf.text = text;
    tf.htmlText = tf.htmlText;
trace(tf.text == text); // false

the expected result is true

[ylazy]

another example:

import flash.text.TextField;

var tf:TextField = new TextField();
    tf.text = "test";
var htmlText1:String = tf.htmlText;
    tf.text = "test\n";
var htmlText2:String = tf.htmlText;
trace(htmlText1 == htmlText2); // true

the expected result is false the actual result is true (different text, same htmlText)

[ylazy]

Why this is an issue?

Imagine you're building a code highlighter or something similar. You get the .htmlText, and do something with it (just styling e.g. changing some color, some font size...). Then you set back the .htmlText and you don't want any changes to happen to the text because you just want to change the style. But currently, the text was changed. (Data loss)

related issue: #2065

[ylazy]

What is the expected behavior?

The <p></p> means <p>I'm a paragraph</p>

So:

Case 1:

text: "" (empty)
(expected) htmlText: "<p></p>" (empty paragraph)
(actual) htmlText: "" (empty) (incorrect)

Case 2:

text: "\n"
(expected) htmlText: "<p></p><p></p>" (two empty paragraph)
(actual) htmlText: "<p></p>" (incorrect)

Case 3:

text: "\nparagraph2" (paragraph 1 is empty)
(expected) htmlText: "<p></p><p>paragraph2</p>" (paragraph 1 = empty <p></p> tag)
(actual) htmlText: "<p></p><p>paragraph2</p>" (correct)

Case 4:

text: "paragraph1"
(expected) htmlText: "<p>paragraph1</p>" (non-empty paragraph)
(actual) htmlText: "<p>paragraph1</p>" (correct)

Case 5:

text: "paragraph1\n" (paragraph 2 is empty)
(expected) htmlText: "<p>paragraph1</p><p></p>" (paragraph 2 = empty <p></p> tag)
(actual) htmlText: "<p>paragraph1</p>" (incorrect)

Case 6:

text: "paragraph1\nparagraph2"
(expected) htmlText: "<p>paragraph1</p><p>paragraph2</p>"
(actual) htmlText: "<p>paragraph1</p><p>paragraph2</p>" (correct)

Case 7:

text: "paragraph1\nparagraph2\n\n" (paragraph 3 & 4 are empty)
(expected) htmlText: "<p>paragraph1</p><p>paragraph2</p><p></p><p></p>" (paragraph 3 & 4 = empty <p></p> tag)
(actual) htmlText: "<p>paragraph1</p><p>paragraph2</p><p></p>" (incorrect)

Case 8:

text: "paragraph1\n\nparagraph3" (paragraph 2 is empty)
(expected) htmlText: "<p>paragraph1</p><p></p><p>paragraph3</p>" (paragraph 2 = empty <p></p> tag)
(actual) htmlText: "<p>paragraph1</p><p></p><p>paragraph3</p>" (correct)