[epg] Fix navigating to the sidebar with cursor keys

[Jalle19]

When setting epg.lingertime to zero (which means past EPG data is disabled and you can access the sidebar by pressing left when you're at the leftmost item) two Left-presses are required to open the sidebar if you've previously moved up or down in the timeline. If you move one programme to the right on a channel and then start going left the sidebar opens on the first attempt as expected.

This is because m_item is wrongly set when changing channels (ie. moving up and down) because the m_channelCursor variable is only updated after the new item has been determined, which causes the wrong item to end up as m_item.

@xhaggi could you review?

If #4526 gets merged for Gotham I think this should too.

[Jalle19]

@opdenkamp could you take a look at this? I'm not very familiar with this code.

[xhaggi]

i'll do a review when I have time

[Jalle19]

@xhaggi updated (don't know why I didn't opt for this approach from the beginning) and it still works.

[xhaggi]

Thanks ;) .. @t-nelson your button.

[t-nelson]

Since @opdenkamp declined #4526 for Gotham, is this a no-go as well?

[xhaggi]

fine with me so up to RMs

[t-nelson]

@opdenkamp opinion?

[opdenkamp]

didn't test, but looks okay. as for #4526 : i am only against changing the default value to 0