#569 prev_frame goes wrong after a reset

[Manuel Bilderbeek]

Scenario:

• with reverse enabled, just run a machine for a while
• reset the machine
• use prev_frame

This will jump much more than just one frame backwards.

Quick analysis: prev_frame (indirectly) uses "machine_info time", but this time is reset to 0 after the reset command...

Perhaps the reset command shouldn't reset the MSX time? (What else is relying on 'machine_info time' like this? And what might be relying on reset also causing a reset of the machine time?)

Thanks to mth for reporting/noticing this.