gocui: [BUG] Mouse handling delayed in neovim terminal

Describe the bug Mouse clicks inside neovim terminal are delayed until the next system event. Mouse handling works fine with jroimartin/gocui

To Reproduce Steps to reproduce the behavior:

1. Open nvim
2. Open the nvim terminal with :term
3. Run a gocui project that uses the MouseLeft keybinding
4. Notice that nothing happened
5. Press a random key on the keyboard
6. Notice that the mouse press is now detected

Expected behavior The mouse click should be detected immediately

Environment (please complete the following information):

• OS: macOS catalina
• nvim 0.5

Context

• Calling g.Update does not help
• MouseRelease is trigged (although not on release)`