Incorrectly blinking cursor in Opera with CL-GD5446

[Vort]

After Opera 9.64 is started in Windows 98 with CL-GD5446 card, text cursor starts blinking in address bar.
Sometimes it blinks normally, but sometimes dot of wrong color appear in the middle of it.
When it happens, sometimes dot blinking is synchronized with cursor blinking, sometimes not.

Cursor rendering with CL-GD5446 driver (default one was used in this test, don't know if it matters) consists of several steps, one of which (dot in the middle) is made using bx_svga_cirrus_c::svga_simplebitblt, rest is made using bx_svga_cirrus_c::mem_write.
For this method to work correctly, BLTs should be perfectly synchronized with memory writes, but something goes wrong. Sometimes.

bochs_opera_blink.mp4

Version: abe3a6f