I searched for this and didn't find anything. Mods: If this is a repeat, is included in documentation somewhere, and/or has an easier solution, please feel free to delete.

1. Find the path to your Suitcase font vault. You can find that in Suitcase by going to Preferences > Type Core
2. Go to /Applications. Right-click/CTRL+click on Inkscape.app. Select "Show Package Contents" from context menu.
3. Navigate to Contents/Resources/etc/fonts/conf.d/51-local.conf. Open in a text editor.
   The file should look something like this:
   

   Code: Select all

   <?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
   <!-- Load local system customization file -->
   <include ignore_missing="yes">local.conf</include>
</fontconfig>

4. Somewhere inside the <fontconfig> tags, insert the path from step 1. For good measure, I also included the font directory for my user account. My file ended up looking like this:
   

   Code: Select all

   <!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
   <!-- Load local system customization file -->
   <include ignore_missing="yes">local.conf</include>
   
   <!-- MY USER FONT DIRECTORY -->
   <dir>/Users/myusername/Library/Fonts</dir>
   
   <!-- SUITCASE FONT LOCATION FROM STEP 1 -->
   <dir>/Users/myusername/Library/Extensis/Suitcase Fusion/</dir>
</fontconfig>

5. Restart Inkscape.

It should now behave normally WRT font activation through Suitcase. On my system, I do not need to restart Inkscape when I activate or deactivate fonts in Suitcase.

Thanks for submitting Asking as a Linux user: What is suitcase? A font manager software?

Yes, it's probably the most commonly used font manager for Mac, at least for graphic design pros.

Thanks!