selectrum-completion-in-region does not respect a remote (TRAMP) environment

[Raphus-cucullatus]

Here is how I reproduce this.

When there is no selectrum-completion-in-region (prior to 8857a8fbf05aaaf231eff9c681427166c286bf35):

• Find a remote file. For example, C-x C-f /ssh:vm00:/home/fan/works/hybmem/scripts/.
• Execute a shell command: M-! ls ~/, then press <TAB>.
• Home files on this remote machine are shown. This is expected.

However when I use master:

• Find a remote file. For example, C-x C-f /ssh:vm00:/home/fan/works/hybmem/scripts/.
• Execute a shell command: M-! ls ~/, then press <TAB>.
• Home files on my local machine are shown.

Originally posted by @Raphus-cucullatus in https://github.com/raxod502/selectrum/issues/100#issuecomment-636470100

[raxod502]

Thanks for the report.