Tabs are not restored on startup if Thunar was launched with a URI argument
#### Reproduction steps 1. Enable "Restore tabs on startup" in Behavior section of Thunar preferences 2. Open at least one tab 3. Close all instances of Thunar 4. Run `thunar ~`, or `xdg-open ~` if Thunar is set to the default file browser #### Expected behavior Previous tabs should be restored, in addition to the home folder being opened as either a new tab or window, depending on the configured "Open new thunar instances as tabs" preference. #### Actual behavior The home folder opens in a new Thunar instance and previous tabs are not restored. Running `thunar` while this instance is still open restores the previous tabs, potentially multiple times if run repeatedly. Running thunar version 4.18.7.
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