This package shows Flymake diagnostics on cursor hover. This works on both graphical and non-graphical displays.
flymake-popon on GUI using Posframe.
flymake-popon on terminal using Popon.
Install from NonGNU ELPA.
(quelpa '(flymake-popon
:fetcher git
:url "https://codeberg.org/akib/emacs-flymake-popon.git"))(straight-use-package
'(flymake-popon
:type git
:repo "https://codeberg.org/akib/emacs-flymake-popon.git"))Enable with M-x flymake-popon-mode. All customization options can
be found by M-x customize-group RET flymake-popon.