I’d find it useful if there were a Preference setting to set Glyphs to start up with the same file(s) open that were open when it was last quit.
This should be the case already. If you do not close the documents but just hit cmd+Q. What version of Glyphs and MacOS do you have?
No, doesn’t work for me. Open file, Cmd-Q, reopen application: no document opens.
Glyphs 1.3.24 (506)
OS X 10.6.8
This is a system feature of OS X 10.7 and above.