#301 Vietnamese diacritics are misplaced and base letters are missing in bold and bold italic

[Minh Nguyen]

Linux Libertine Bold and Bold Italic are unreadable in Vietnamese because most letters are malformed or incomplete:

Character	Linux Libertine Bold
ằ	Grave is too low
Ẳ	Hook is to the left of the breve; it should sit above the breve like ẳ
Ẵ	Tilde and breve should be swapped
ắ	Acute is too low
ẩ	Circumflex and hook shouldn't touch
Ẩ	Circumflex and hook shouldn't touch
Ẫ	Tilde and circumflex should be swapped
Ậ	Circumflex is too high
ể	Hook is too low
Ể	Circumflex is too high; hook is too low
Ễ	Tilde and circumflex should be swapped
Ệ	Circumflex is too high
ổ	Circumflex and hook shouldn't touch
Ổ	Circumflex and hook shouldn't touch
Ỗ	Tilde and circumflex should be swapped
Ộ	Circumflex is too high
Ờ	Grave is too high
Ớ	Acute is too high
ư	Horn is too far to the left
ừ	Horn is too far to the left
Ừ	Grave is too high
ử	Horn is too far to the left
ữ	Horn is too far to the left
ứ	Horn is too far to the left
Ứ	Acute is too high
ự	Horn is too far to the left
Ỳ	Grave is too high

Character	Linux Libertine Bold Italic
ằ	Grave is too far to the left; it should sit above the breve
Ằ	Grave is too far to the left; it should sit above the breve
ẳ	Hook is too low and too far to the left; it should sit above the breve
Ẳ	Hook is too low and too far to the left; it should sit above the breve
Ẵ	Tilde is too low; breve is too high and too far to the left
ắ	Acute is too low and too far to the left; it should sit above the breve
Ặ	Breve is too high and too far to the left
Ầ	Grave is too far away from the circumflex
ẩ	Hook is too low and too far to the left
Ẩ	Hook is too low and/or too far to the left
Ẫ	Circumflex is too high and too far to the left
ấ	Acute is too low and/or too far to the left
Ậ	Circumflex is too high and too far to the left
ẻ	Hook is too low and too far to the left
Ẻ	Hook is too low and too far to the left
Ề	Grave is too far away from the circumflex
ể	Hook is too low and too far to the left
Ể	Hook is too low; circumflex is too high and too far to the left
Ễ	Circumflex is too high and too far to the left
ế	Acute is too low
Ệ	Circumflex is too high
ỉ	Hook is too low and too far to the left
Ỉ	Hook is too low and too far to the left
ỏ	Hook is too low and too far to the left
Ỏ	Hook is too low and too far to the left
Ồ	Grave is too far away from the circumflex
ổ	Hook is too low and too far to the left
Ổ	Hook is too low and too far to the left
Ỗ	Circumflex is too high and too far to the left
ố	Acute is too low
Ộ	Circumflex is too high and too far to the left
ơ	Missing
Ơ	Missing
ờ	Base letter ơ is missing; looks like `
Ờ	Base letter ơ is missing; looks like `
ở	Base letter ơ is missing; looks like ̉
Ở	Base letter ơ is missing; looks like ̉
ỡ	Base letter ơ is missing; looks like ~
Ỡ	Base letter ơ is missing; looks like ~
ớ	Base letter ơ is missing; looks like ́
Ớ	Base letter ơ is missing; looks like .
ợ	Base letter ơ is missing; looks like .
Ợ	Base letter ơ is missing; looks like .
ủ	Hook is too low and too far to the left
Ủ	Hook is too low and too far to the left
ụ	Dot is too far to the left
ư	Missing
Ư	Missing
ừ	Base letter ư is missing; looks like `
Ừ	Base letter ư is missing; looks like `
ử	Base letter ơ is missing; looks like ̉
Ử	Base letter ơ is missing; looks like ̉
ữ	Base letter ơ is missing; looks like ~
Ữ	Base letter ơ is missing; looks like ~
ứ	Base letter ơ is missing; looks like ́
Ứ	Base letter ơ is missing; looks like a space
ự	Base letter ơ is missing; looks like .
Ự	Base letter ơ is missing; looks like .
ỳ	Grave is too far to the left
Ỳ	Grave is too far to the left
ỷ	Hook is too far to the left
Ỷ	Hook is too far to the left

The attached images contain each variant of Linux Libertine, for comparison.