MemoryWidget: Make search address a combobox that holds address history.

[TryTwo]

Always update the combobox when a new target address is sent.

The main problem was that navigating to an address from another widget wouldn't update the address box. It worked for peeking at a section, then going back to the original, unchanged search address, but not much else. I added a 10 slot history of addresses so you could keep your old address. All navigated to addresses (from other widgets) will go into the text box and history box automatically and the original address that gets overwritten will be saved in the combo box too.

Two issues in doing this were the offset box and typed addresses. The offset box is too cumbersome to worry about imo, selecting an address from the combobox will add the offset box to it. Typed addresses don't feel like they should immediately be added to the history box. If you press ENTER it will go into the history.

[sepalani]

When m_search_address->maxCount is reached, entries won't be inserted anymore. Is that an intended behaviour (i.e. to only save the first 10 entries)?

Otherwise, the code LGTM.

[TryTwo]

Oh thanks for pointing that out. It needs to push out the oldest when it hits max.

[TryTwo]

I just changed it to m_search_address->setMaxVisibleItems(8); which should be fine. It'll just give a scrollbar.

[sepalani]

LGTM.

One future improvement would be the ability to delete entries from the history. Something similar to Chrome/Firefox where you could delete the autocomplete/autofill entry by selecting it and pressing the del key.