Copy path from meld window
Solution 1:
I downgraded Meld to 1.5.3 with the following actions:
sudo wget http://old-releases.ubuntu.com/ubuntu/pool/universe/m/meld/meld_1.5.3-1ubuntu1_all.deb -O /var/cache/apt/archives/meld_1.5.3-1ubuntu1_all.deb
sudo dpkg -i /var/cache/apt/archives/meld_1.5.3-1ubuntu1_all.deb
sudo apt-get install -f
cat <<EOF | sudo tee /etc/apt/preferences.d/pin-meld
Package: meld
Pin: version 1.5.3-1ubuntu1
Pin-Priority: 1337
EOF
It works better for me. It has for example very useful <Ctrl+Shift+R> shortcut and close with <Ctrl+Q>. Also you can copy file paths with it.