Mintty: Weird behavior with Meslo fonts (inducing condensed ligatures)

[avoidik]

On the first line you can see in echo output that "f"-character somehow influences the next character after it. When I press Up arrow on keyboard (select previous command from history) same issue occurs for actual input.

mintty 2.8.4

Font MesloLGM NF from here:
https://github.com/ryanoasis/nerd-fonts/tree/master/patched-fonts/Meslo/M/complete

[mintty]

"fl" is substituted by an fl ligature here.
For a fixed-width font, if it includes ligature replacement, the ligatures used as substitutes should not affect the total string width, like FiraCode does (see #601). Apparently this Meslo version does not respect fixed font width when handling ligatures. Please report this as a bug to the font.

[avoidik]

More interestingly that I haven't had any issues with 2.7.9 version

[mintty]

2.8.3 fixed ligature support. But the behaviour of that font is broken.

[ryanoasis]

https://github.com/ryanoasis/nerd-fonts/issues/186 might be of relevance to you

[mintty]

Cannot reproduce with the linked font, was it updated meanwhile?
As a workaround, you could also try to set -o FontRender=textout.

[avoidik]

Could you please try with following settings

minttyconfig

BoldAsFont=-1
Columns=161
Rows=35
ThemeFile=4bit.theme
ClipShortcuts=yes
WindowShortcuts=yes
SwitchShortcuts=yes
AltFnShortcuts=yes
ScrollbackLines=5000
CopyOnSelect=yes
ClickTargetMod=shift
ClicksTargetApp=no
CopyAsRTF=yes
RightClickAction=menu
Locale=en_US
Charset=UTF-8
Language=
Font=MesloLGM NF
FontHeight=10

minttythemes4bit.theme

BackgroundColour=13,25,38
ForegroundColour=217,230,242
CursorColour=217,230,242
Black=0,0,0
BoldBlack=38,38,38
Red=184,122,122
BoldRed=219,189,189
Green=122,184,122
BoldGreen=189,219,189
Yellow=184,184,122
BoldYellow=219,219,189
Blue=122,122,184
BoldBlue=189,189,219
Magenta=184,122,184
BoldMagenta=219,189,219
Cyan=122,184,184
BoldCyan=189,219,219
White=217,217,217
BoldWhite=255,255,255

[avoidik]

With -o FontRender=textout it worked as expected, without the glitch. mintty is from git-for-windows package

[mintty]

Cannot reproduce with your config file. I doubt we're having the same font version because for me the font properties info show Leading: -3, Underline: manual.

[mintty]

I would have waited with closing this issue until I could reproduce a Meslo update that fixes this.
However, as I couldn't even reproduce the broken ligatures in the first place, can we close the issue or is anything still unclear?

[avoidik]

Yes, please close it

[mintty]

With the next release, it will be possible to configure using a "nerd font" or otherwise for for "Powerline" only for Private Use ranges.

[mintty]

Released 3.1.0.