Did you consider wxWidgets? I chose it over Qt and Electron for a recent project, because it gave me the most native looking UI across Mac/Win/Linux, and resulted in a small binary size and memory footprint. The project was an SSH file browser. Sounds like your project is also file browser related, so you may be able to get some inspiration or even reuse parts: https://github.com/allanrbo/filesremote
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I am researching wxWidgets at the moment. I really like the small file size on the FilesRemote and how quickly it starts up. Those are a big plus for me. I am not too concerned about the native look and feel because of the type of app I am making, but the speed is a huge plus.
I was about to suggest wx too. :) Currently they natively support GTK and WinAPI as backends, which is why it's so fast. In case they revive wxQt, it'll be my choice for new projects.
But right now, from UX and portability perspectives, Qt wins.