Re: Broken commandline

[Hans-Peter Sorge]

Hi Kasper,

the console (Konsole) uses
    /etc/vconsole.conf
    FONT=latarcyrheb-sun16  # 
/usr/lib/kbd/consolefonts/latarcyrheb-sun16.psfu


Noto Sans Mono behaves the same. And it is not listed 
in/usr/lib/kbd/consolefonts/

I tried to find the underlying reason for the bug.

Your hint about wcwidth is helpful.

I hope to find some time digging deeper:-)

btw - Konsole is really 'broken'.

After playing with the different UF8 chars I have to [ENTER] twice to 
execute a command
(need to do reset).

Best Regards
Hans-Peter


Am 04.06.21 um 10:24 schrieb Kacper Gutowski:
> On Fri, Jun 04, 2021 at 12:47:31AM +0200, Hans-Peter Sorge wrote:
> > However, there are "graphically oriented" UTF characters (including 
> > ⍝⊖⍟⍱), that take two character positions when being displayed and 
> > take one character position when being selected.
> >
> > So it's not an APL character / font handling problem. It Just 
> > happened to be the first popup.
>
> This sounds indicative of the kind of font problem where the terminal 
> emulator has a different idea about widths of glyphs than what the 
> font actually provides, i.e. when the font isn't really monospaced.
>
> You mentioned Noto Sans Mono earlier. If APL characters are displayed 
> for you using that font, either because you chose it or because your 
> chosen font doesn't have them and Noto Sans Mono happens to be used as 
> a fallback, then you surely will have this problem because the 
> mentioned characters are twice as wide as other characters in this font.
>
> And it's for no good reason. Unlike Chinese characters, these were 
> never a part of any East Asian character set (unless you count a 
> certain communist symbol from North Korean character set being 
> informally mapped to ⍟ by some sources) and their East Asian Width 
> property in Unicode is "neutral" and wcwidth returns 1 for them. So 
> they are expected to take only one character cell and in many terminal 
> emulators this leads to the behaviour you described when they don't.
>
> This should be considered a bug in Noto Sans Mono.
>
> -k