Invisible / missing characters in some terminals on Linux

[k1sul1]

In some terminals (LXTerminal, xfce4-terminal, libvte in general) ligatures seem to work. => renders as it should for instance. But an equal sign (=) doesn't display at all, it seems to render as a space, but when copied it of course contains the sign:

this is text copied from my terminal = and the equal sign is missing

The "implemented symbols" string prints out rather weird too:

The only terminals I've managed to get ligatures to render properly with are Konsole and QTerminal, which both contain bugs that make them unusable for me in daily use, for example:

• QTerminal "resizes" by adding a row every time nvim is opened
• Konsole has support for changing font size on the fly, but it doesn't persist.

I'm guessing this has something to do with libvte in general, but I haven't been able to find a bug report explaining why some of them work and why some of them don't render at all.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=822231 (screenshots are dead..)

Related: tonsky/FiraCode#139

[k1sul1]

@christianpoveda Give konsole a try, I now use it daily. I worked around the font size bug by using profiles "properly".

[beanaroo]

Libvte lacks ligature support