Thank you so much ptitSeb! Actually I was quite excited by Seldon's report about the tearing fix. So I downloaded the latest version, and indeed the tearing was fixed (for example in the GBC emu)! A huge improvement!
However, when I ran the GBC emu again, the tearing reappeared! Very strange, since I was indeed sure it had gone last time I had launched it. Now every time I launch it, the tearing is there again, even after a reboot. I'll try to investigate more, and see if this tearing may have another cause.
Thanks for the great work!
(btw, do you think it could be possible to remove the vertical dotted line on the top right corner of the screen, obviously coming from the Android version? It is useless on the Pandora since the space bar can bring the menu, and it would be less annoying for people who like full screen games)
Edit: ok, I have a pattern. If the config file exists in the corresponding appdata folder of the GBC emu, the tearing is back. If I delete it, the tearing will be gone on the next launch. When I quit, the config file is recreated again, and from this moment, all future launches will have tearing. I hope it will help fix this issue once and for all, because those emus are really good. Thank you!