FiraCode
                                
                                
                                
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                        Diagonal line character U+2571 is too small
In most fonts the character ╱ (U+2571 ) spans from top to bottom which allows drawing diagonal lines over multiple lines, however in FiraCode it doesn't.
This is what it looks like in most other fonts (this is NotoSansMono Nerd Font):

This is what it looks like in FiraCode:

Not really. This is what they look in Fira Code v6 right now (the empty space in the middle is a bug, will fix)
                                    
                                    
                                    
                                
With the fix (in v7):
                                    
                                    
                                    
                                
You're probably right. I realize that I'm running a version of FiraCode that I patched like a year ago or more. I'll make sure to update. Thanks!