I tried the script but I get an error. Below is what I did and the error:
Andreis-MacBook-Pro-3:pharobug andrei$ ./pharo Pharo.image eval "Smalltalk snapshot: true andQuit: true"
Andreis-MacBook-Pro-3:pharobug andrei$ ./resizesqueakwindow Pharo.image 840 640
0+1 records in
4+0 records out
1 truncated record
4 bytes transferred in 0.000708 secs (5651 bytes/sec)
Andreis-MacBook-Pro-3:pharobug andrei$ ./pharo-ui Pharo.image
2017-03-29 21:07:38.977 Pharo[53599:3054457] Error (1000) creating CGSWindow on line 281
2017-03-29 21:07:38.979 Pharo[53599:3054457] (
0 CoreFoundation 0x96699c63 __raiseError + 195
1 libobjc.A.dylib 0x9018da2a objc_exception_throw + 276
2 CoreFoundation 0x96699b7d +[NSException raise:format:] + 141
3 AppKit 0x9ad410a5 _NSCreateWindowWithOpaqueShape2 + 1728
4 AppKit 0x9ad3f06d -[NSWindow _commonAwake] + 2227
5 AppKit 0x9adcef30 -[NSWindow _makeKeyRegardlessOfVisibility] + 104
6 AppKit 0x9adcee86 -[NSWindow makeKeyAndOrderFront:] + 35
7 Pharo 0x000b07b0 -[sqSqueakOSXOpenGLView drawThelayers] + 212
8 Pharo 0x000b718b -[sqSqueakScreenAndWindow ioForceDisplayUpdate] + 196
9 Pharo 0x000b6e60 ioForceDisplayUpdate + 61
10 Pharo 0x0007a66d primitiveShowDisplayRect + 212
11 Pharo 0x0003c1cd interpret + 25816
12 Pharo 0x000452e2 enterSmalltalkExecutiveImplementation + 135
13 Pharo 0x00035f7b interpret + 646
14 Pharo 0x000b68d0 -[sqSqueakMainApplication runSqueak] + 476
15 Foundation 0x988ea0ae __NSFirePerformWithOrder + 416
16 CoreFoundation 0x965a481e __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
17 CoreFoundation 0x965a4760 __CFRunLoopDoObservers + 400
18 CoreFoundation 0x965960c2 __CFRunLoopRun + 946
19 CoreFoundation 0x96595aa6 CFRunLoopRunSpecific + 390
20 CoreFoundation 0x9659590b CFRunLoopRunInMode + 123
21 HIToolbox 0x993a38f8 RunCurrentEventLoopInMode + 262
22 HIToolbox 0x993a3503 ReceiveNextEventCommon + 192
23 HIToolbox 0x993a342c _BlockUntilNextEventMatchingListInModeWithFilter + 99
24 AppKit 0x9ad2cb41 _DPSNextEvent + 742
25 AppKit 0x9ad2c1e5 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 350
26 AppKit 0x9ad20b9c -[NSApplication run] + 907
27 AppKit 0x9ac95fa0 NSApplicationMain + 2082
28 libdyld.dylib 0x9a6a66d9 start + 1
29 ??? 0x00000002 0x0 + 2
)
^C