15-tools: strata --install-portal makes strata the portal file chooser

.chezmoiscripts/run_onchange_after_15-tools.sh.tmpl

@@ -55,4 +55,14 @@ fi
 if [ ! -e "$HOME/.local/bin/strata" ]; then
     curl -fsSL https://raw.githubusercontent.com/lgse/strata/main/install.sh | bash -s -- --with-desktop-entry --with-file-manager
 fi
+
+# System file chooser: strata serves org.freedesktop.impl.portal.FileChooser
+# for portal-aware apps (browsers, GTK). --install-portal writes the .portal
+# and D-Bus service under ~/.local/share, prepends "strata;" to the
+# FileChooser line of ~/.config/xdg-desktop-portal/<desktop>-portals.conf
+# (copied from the system one if absent; strata owns that file, not chezmoi,
+# so `strata --uninstall-portal` can restore it), and restarts the portal.
+if [ -e "$HOME/.local/bin/strata" ] && [ ! -e "${XDG_DATA_HOME:-$HOME/.local/share}/xdg-desktop-portal/portals/strata.portal" ]; then
+    "$HOME/.local/bin/strata" --install-portal
+fi
 {{- end }}