[MacPorts] #64325: app PortGroup: app.icon unable to handle filenames with spaces

[MacPorts]

#64325: app PortGroup: app.icon unable to handle filenames with spaces
------------------------+------------------------
 Reporter:  jasonliu--  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.7.1
 Keywords:              |       Port:  pg-app-1.0
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 When using the app PortGroup, if you try to specify an {{{.icns}}} file
 with a space in the filename, it always tries to add {{{port:makeicns}}}
 as a dependency. I've tried multiple possible iterations of quoting a
 path/filename with spaces:

 {{{
 app.icon    "subdir/file with spaces.icns"
 app.icon    "subdir/file\ with\ spaces.icns"
 app.icon    {subdir/file with spaces.icns}
 app.icon    {subdir/file\ with\ spaces.icns}
 }}}

 none of which are working. It looks like the problem may be somewhere
 inside {{{proc app._icon_trace}}}, although I'm not exactly sure what that
 problem could be.

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Ticket URL: <https://trac.macports.org/ticket/64325>
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