The trouble with how this project filtering works now in Polygerrit is that it treats '/' '_' and ' ' (slash, underscore, space) in the filter box the same way: as word separators.
Unlike in the old UI in 2.16 or in both UIs in 2.15, where '/' is used literally as part of a string to search for.
Now coming from 2.15, where we created quite elaborate hierarchies of projects using '/', the current filtering in Polygerrit breaks the whole concept of hierarchies.
E.g. we have many project like that:
A/B/C/x
A/B/C/foo
A/B/C/bar
D/E/x
F/G/H/I/x
Putting 'A x' or 'A/x' or 'A_x' or 'x/a' or 'x a' in the filter box will always return the same result
(What's interesting, searching for 'x' will look for 'x' even in the project description! (but 'x A' will stop searching through the description and will look into project name only :) ))
It's really hard to understand the logic.
But most importantly, with the current logic I'm not able to show only part of the hierarchy, e.g. all projects that start with 'A/B'
The fix would be to start treating '/' and '_' literally as part of project names.
Would be great because I could search for A/B/*/x putting 'A/B x' or 'x A/B' in the filter box.
PS.
Filtering box for groups works as it used to work in 2.15 :)