In Windows 2000/XP the default file manager has a sidebar search:
I like to see something similar integrated in PCManFM.
In fact, something similar is integrated into PCManFM already. Go to main menu -> Tools -> Find Files.
Thank you very much.
That's an external dialog. That's not the same as having the search in the sidebar.
You marked them falsely as "Invalid". Please fix that.
I'm afraid that all the rich options that are available in pcmanfm will not fit into small space of sidebar. It's main reason why the search options are opened as a separate window. If you have another idea then feel free to reopen the request. Thank you very much.