Summary

Fixes various video issues related to the PS/55 Display Adapter II, especially when using with OS/2.

• Fixed a Bitblt command parser to solve an issue that incorrect foreground text color appears on an active window in OS/2 J1.3.
• Added FIFO buffering to work with sequential BitBlt operations in OS/2 J2.0.
• Changed the write ROP to fix a text glitch issue when the mouse is moving in OS/2 J1.3.
• Added an overwrite ROP command to fix an issue that incorrect color appeared on the scroll bar in OS/2 J1.3.
• Changed BitBlt Mode 3 operation to fix an issue that a grayout button had broken in OS/2 J2.0.

It will probably fix bugs mentioned in #5239 .

Checklist

• Closes #xxx
• I have tested my changes locally and validated that the functionality works as intended
• I have discussed this with core contributors already
• This pull request requires changes to the ROM set
  • I have opened a roms pull request - https://github.com/86Box/roms/pull/changeme/
• This pull request requires changes to the asset set
  • I have opened an assets pull request - https://github.com/86Box/assets/pull/changeme/

References

Provide links to datasheets or other documentation that helped you implement this pull request.