google/material-design-icons

LIGA and RLIG

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#1,891 opened on Mar 22, 2025

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Description

Hi,

I am sorry to bother, this is not an issue with the Material Symbols Font but I have researched for quite some time now and I am kindly asking for a help or a small lead, I would be so thankful... :-)

I used Material Icons in a private C# WPF Application and it works fine. I now tried to upgrade to the Material Symbols. Unfortunately the ligatures do not work anymore.

I have analyzed the fonts and I think I have found the issue: it seems that the Material Icons use the "Liga" Ligatures and the new Material Symbols use the "RLIG" Ligatures. The latter is not supported by WPF. I am no font expert and this seems to be a kind of nieche topic which I was not able to find good resources. Is there a way to get the Material Symbols with "Liga" ligatures. Is this an easy conversion or is this a larger format change?

Thank you for reading <3

Contributor guide

Research direction
Examine the font files using a font editor (e.g., FontForge) to identify the ligature tables (LIGA vs RLIG) and create a script to convert RLIG to LIGA, then test in WPF.
Tech stack
None
Domain
desktop
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
C#WPF
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50