Fix Cascadia Code 2007.01 problem with font-patcher

[why]
With the Cascadia Code 2007.01 release the font-patcher process ends
with a segfault. The reason is unknown. Probably some internal structure
of the ttf file and the patching process leads to triggering a bug in
fontforge.

[how]
Nicola (xbb@github) found out, that rewriting the font file with fontforge
is possible. The rewriting process skips some of the font internal
properties - one of them is the reason for the crash.

So we open and save the Cascadia Code font without doing anything to it,
and work with that 'cleaned' font file onwards.

Thanks to Nicola for the hint with rewriting.

Fixes: adam7#39

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

.github/workflows/generate-fonts.yml

@@ -15,7 +15,6 @@ jobs:
         echo Downloading ${CASCADIAVERS}
         curl -L https://github.com/microsoft/cascadia-code/releases/download/${CASCADIAVERS}  -O
         unzip CascadiaCode*.zip
-        mv **/CascadiaCodePL.ttf .
     - name: Install FontForge
       run: |
         sudo add-apt-repository ppa:fontforge/fontforge -y -u;
@@ -32,6 +31,8 @@ jobs:
       run: pip install configparser
     - name: Extract additional powerline glyphs
       run: fontforge -lang=ff -script extract-extra-glyphs
+    - name: Prepare Caskadia Code font file
+      run: fontforge prepare-font --input **/CascadiaCodePL.ttf --output CascadiaCodePL.ttf
     - name: Build Powerline
       run: |
         fontforge -script font-patcher --careful --powerline --custom SomeExtraSymbols.otf \

prepare-font

@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+# coding=utf8
+
+import fontforge
+from argparse import ArgumentParser
+
+# Setup and parse the comand-line arguments
+parser = ArgumentParser()
+parser.add_argument("--input", help="input file name")
+parser.add_argument("--output", help="output file name")
+args = parser.parse_args()
+
+# Just open and save the font, to fix some internal structure
+fontforge.open(args.input).generate(args.output)