libui/checklist_attrstr

= attributed strings
attribute lengths are rounded to complete unicode codepoints
zero-length attributes are elided
consecutive attributes of the same type and value are merged
overlapping attributes of different types do not split each other
overlapping attributes of the same type but different values do split
empty string is allowed
empty string cannot have attributes
font family names are case-insensitive both in attributes and in descriptors
attributes are unique throughout a Unicode codepoint, not just to UTF-8 bytes
define what "it is an error" means in the case of uiFreeAttribute() and all uiAttributeValue() functions
does uiAttributeFamily() return a normalized string
Okay, I need to rethink these APIs. Let's start doing so. Then I should also write a testsuite for uiAttributedString. 2017-11-05 21:52:14 -06:00			`= attributed strings`
			`attribute lengths are rounded to complete unicode codepoints`
			`zero-length attributes are elided`
			`consecutive attributes of the same type and value are merged`
			`overlapping attributes of different types do not split each other`
			`overlapping attributes of the same type but different values do split`
			`empty string is allowed`
			`empty string cannot have attributes`
More attributed string API work. Of note, decided to make each type of attribute have its own field in uiAttributeSpec, to make thinking about what to do next easier (and because why not). 2017-11-06 22:58:12 -06:00			`font family names are case-insensitive both in attributes and in descriptors`
Decided what to do about attributes. 2017-12-09 22:47:50 -06:00			`attributes are unique throughout a Unicode codepoint, not just to UTF-8 bytes`
			`define what "it is an error" means in the case of uiFreeAttribute() and all uiAttributeValue() functions`
			`does uiAttributeFamily() return a normalized string`