[I18N][INTLDNA][Multilingual Text Support]: Accents in Latin are not deleted independently of their base characters

[julieyuan]

Steps:

1. Launch Brackets.
2. New a file and input the below Latin characters in the file: Quốc Ngữ (as how to input this string, please refer to here )
3. Place the cursor to the right of the last character of the string. Then, press the backspace key multiple times, and verify that accents are deleted independently of their base characters. For example, the tilde character (~) should be deleted before the u with horn character (u).

Results:
Accents are deleted with their base characters and not deleted independently.

Expected:
Accents should be deleted independently of their base characters.

ENV: MAC 10.8 and Win7 English OS
Build: 0.44.0-14364

Screenshots:
Please refer to the screenshots below:
Expected behavior:

Brackets view:

[peterflynn]

@julieyuan Are these double-byte characters or surrogate pairs? Can they be represented in UTF-8 or only in UTF-16?

[julieyuan]

@peterflynn I will investigate it, then give you feedback.

[julieyuan]

@peterflynn These characters can be represented in UTF-8. If I save them with UTF-8 and open it with notepad++, then can see their Hex value. Please refer to the screenshot for character ố:

As Vietnamese has two combine forms for one character: precomposed character and composite character. therefore, for the character ố, if use precomposed character, its Unicode value is 1ED1 ,if use composite character, its unicode value is 0301 00f4, which is combined with two characters: U+0301 and U+00f4. Please refer to the screenshots below:
Precomposed character ss:

Composite character ss:

In this case, characters ố and ữ are composite characters. Here are the Unicode page for U+0301 and U+00f4.

Hope these info could be helpful. Thanks.