Font issue in Devanagari (Hindi) rendering when Gravity Labels is turned on

[alokmandavgane]

Font issue in Devanagari (Hindi) rendering when Gravity Labels is turned on.
I encountered this while displaying stellarium in a dome.

Steps to reproduce

• Turn on Gravity Labels in Tools->Planetarium Option
• Set the Sky Culture to Indian (Nakshatras) (for eg)
• Screen Label to native

[gzotti]

We have seen other "font issues with gravity labels" for Arab and Cuneiform fonts and would welcome contributions (i.e., solutions or at least decisive hints) from developers in the countries which use whatever font property causes this. I expect those developers are familiar with the problem at hand and could tell us why this happens and what to do.

[github-actions]

This is a good task for the community to participate in the contribution into Stellarium. Who wants to help us?

[10110111]

I think these circles denote detached combining characters. If you zoom in, you'll notice that they have some small marks beside them. If so, they must be detected and appended to the associated (preceding?) character when splitting the string into letters.

[10110111]

We can see the following for "स्वातिः":

$ iconv -f utf8 -t utf16be <<< 'स्वातिः' | xxd -g2
00000000: 0938 094d 0935 093e 0924 093f 0903 000a  .8.M.5.>.$.?....

The code points correspond to:

U+0938: स
U+094d: ्
U+0935: व
U+093e: ा
U+0924: त
U+093f: ि
U+0903: ः

If combined, we'll get:

0938 094d     : स्
0395 039e     : वा
0924 093f 0903: तिः