Jump when deleting recording rule

[jan@…]

When deleting a rule from the rule management screen, the cursor is jumping back to the first rule. This makes deleting serveral rules more work than necessary.

[Marc Alban <marcalban@…>]

Patch to fix jumping to the top of the list when deleting a recording rule.

[stuartm]

Marc thanks for the patch, although it's not the preferred solution. I'll commit a better fix soon.

This code needs some serious cleanup as we are triggering multiple list rebuilds when a rule is deleted. Plus we're living in some alternate reality where reschedules apparently take a couple of ms, that's the only reason I can explain calling CountMatches() immediately after deleting a rule. This screen should be monitoring scheduling events instead and generally should be more intelligent about when to make minimal updates vs expensive re-sorts, list rebuilds etc. I should have done all this when it was ported to mythui but I just didn't have the time to refactor/optimise every single screen.

[stuartm]

(In [25764]) Fix the position being lost in the Recording Rules screen when a rule is deleted. Fixes #8460

[stuartm]

Many of the issues I noted when taking a look at this issue are still outstanding, but I'll deal with those when I have more free time.