When multiple audio streams and forced subtitles available, select forced subtitles based on selected language

This is somewhere in-between a bug report and a feature request.

Background

I have a video with these streams packed in the container (sample included):

• Video stream
• Audio stream 1: English
• Audio stream 2: French
• Subtitle stream 1: English, default: no, forced: yes
• Subtitle stream 2: English, default: no, forced: no
• Subtitle stream 3: French, default: no, forced: yes
• Subtitle stream 4: French, default: no, forced: no

In my video, English is the original language, French is dubbed. The forced subtitles are included because somewhere in the movie a language is spoken other than English or French.

Current behaviour

When I change the playback language from English to French, the active forced subtitle is not changed accordingly

Expected behaviour

When I change the language from English to French, the active forced subtitle is changed from the English one to the French one. This would be according to Matroska Specifications:

When there are multiple "forced" tracks, the player should decide on the language of the forced flag or use the default flag if no track matches the use languages.

I hope this can be fixed/implemented!