Add theme update ability to widget container.

4 jobs for 96-list in 8 minutes and 4 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
failed #20014
build:linux

00:01:09

passed #20016
build:redox

00:02:16

passed #20015
build:web

00:08:04

 
  Test
skipped #20017
test:linux
 
Name Stage Failure
failed
build:linux Build
failed to execute command: No such file or directory (os error 2)
is `cmake` not installed?

build script failed, must exit now', /builds/redox-os/orbtk/cargo/registry/src/github.com-1ecc6299db9ec823/cmake-0.1.41/src/lib.rs:835:5
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

warning: build failed, waiting for other jobs to finish...
error: build failed
ERROR: Job failed: exit code 1