[Console] Investigate improving tab autocomplete behavior

[hexaflexahexagon]

What feature is your improvement idea related to?

The effort vs reward of this should be considered but the current behavior of autocomplete can definitely be improved at least a little without rewriting it all. See this issue that was made yonks ago for the best case scenario: https://github.com/ChaosInitiative/Chaos-Source/issues/156

But that may require extensive work for a fairly minor improvement, so if we can cheaply get some bonus UX that may be preferable in the short term.

Describe the solution you'd like

Best case scenario, have both windows (SDK 2013/tf2/css) flavored autocomplete where tab types the full first result, hitting tab again types the full second result and the list doesn't update until you type a key or hit backspace AND bash (CSGO / previously mmod) flavored autocomplete that simply completes up to the most unique sequential characters in all the results.

More info: https://github.com/ChaosInitiative/Chaos-Source/issues/156

Describe alternatives you've considered, if any.

From BLT 4/21/2022 in the team channel:

i think it would be nice to have it in the way that the part that gets cycled 
is already pre-selected so if you start typing again it will just get removed (or backspace)

Additional context

Also see granis' comment here: https://github.com/momentum-mod/game/issues/1527#issuecomment-937912331

[jason-e]

Upon further investigation, CSGO actually has the same behavior as other Source games, so our Console should be updated to mimic that behavior (see ChaosInitiative/Chaos-Source#570)

[Gocnak]

I think this issue was tackled recently by @bltech, are we back to normal?

[lvaness]

I didn't touch the behavior much, I only fixed some bugs with it