I revived this (currently in beta, only works on loki and onwards):

sudo add-apt-repository ppa:tombeckmann/indicator-synapse
sudo apt update
sudo apt install com.github.tom95.indicator-synapse

See https://github.com/tom95/indicator-synapse for instructions on how to get it to open by shortcut. This is also the place where I look forward to your bug reports. Use left/right arrow on a selected item to see context actions.
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