Browsing too many Flatpaks gives error

[mfreeman72]

Since upgrading from LM 22 to 22.1, when browsing through packages in Software Manager, after viewing a certain number of Flatpak package description pages, Software Manager starts putting up the following dialog after every Flatpak description page view:

An error occurred: While opening repository /var/lib/flatpak/repo: opening repo: openat(config): Too many open files

After it starts showing this dialog, I cannot install any Flatpak packages through Software Manager. It seems to reset itself after quitting Software Manager. After I've quit Software Manager and run it again, I can view Flatpak description pages again for a bit, until it hits that point again and starts showing the dialog.