line-break:anywhere should not break shri or ksha conjuncts

[r12a]

test

Results:

• Gecko: ✅❌ for shri and for ksha, but ksha: in ரிக்ஷா leaves க் on previous line, still shaped for half a conjunct Browser: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:94.0) Gecko/20100101 Firefox/94.0
• Blink: ✅ (break-all) wraps ஸ்ரீந as a single unit and ரிக்ஷா as a unit _Browser: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_157) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36
• Webkit: ✅❌ or shri in HTML, but leaves ஸ் behind in textarea; for ksha, in textarea leaves க் behind, in HTML initially moves whole word to next line, then puts ரி back at end of line as you decrease the window width. _Browser: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_157) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.1 Safari/605.1.15

Related tests: Line-breaking & hyphenation