overview: Hide activities when search is activated

This gives the OSK more room

todo:
 - use HdyDeck
 - handle ESC
 - handle num-toplevel == 0
 - make sure unfold is: running apps + favorites

Signed-off-by: Guido Günther <guido.gunther@puri.sm>
17 jobs for search in 46 minutes and 17 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Build
passed #302666
librem5
build:cross-debian-bullseye:i386

00:10:12

passed #302667
librem5
build:native-alpinelinux-edge

00:06:33

passed #302665
librem5
build:native-debian-bullseye

00:10:41

passed #302664
librem5
build:native-debian-buster

00:07:34

 
  Test+Docs
passed #302670
librem5
build-gtkdoc

00:03:40

passed #302672
librem5
check-license-headers

00:02:07

passed #302671
librem5
check-po

00:00:30

passed #302674
librem5
test:smoke:one-output

00:02:50

passed #302675
librem5
test:smoke:two-outputs

00:02:40

passed #302673
librem5
unit-test:native-alpinelinux-edge

00:00:33

passed #302669
librem5
unit-test:native-debian-bullseye

00:03:18

15.4%
passed #302668
librem5
unit-test:native-debian-buster

00:03:15

11.9%
 
  Package
passed #302676
librem5
package:deb-debian-buster

00:06:42

passed #302677
librem5:arm64
package:deb-debian-buster:arm64

00:24:09

passed #302678
librem5
package:deb-pureos-amber

00:06:31

 
  Test Package
passed #302679
librem5
autopkgtest-debian-buster-package

00:01:04

passed #302680
librem5
lintian-debian-buster-package

00:00:33