Crash on OS X Baskerville.ttc when scrolling

Hi,

I received a segfault when scrolling through the Baskerville.ttc file
(bundled with OS X). This only happens after Encoding > Compact is
selected. It doesn't seem to matter which exact font in the
collection is used, the result is the same.

The sources I'm using date from 2014-12-30.

Here is some output from lldb:

% lldb /usr/local/Cellar/fontforge/20141230/bin/fontforge
(lldb) target create "/usr/local/Cellar/fontforge/20141230/bin/fontforge"
Current executable set to '/usr/local/Cellar/fontforge/20141230/bin/fontforge' (x86_64).
(lldb) settings set target.run-args /Library/Fonts/Baskerville.ttc
(lldb) run
Process 94072 launched: '/usr/local/Cellar/fontforge/20141230/bin/fontforge' (x86_64)
Copyright (c) 2000-2014 by George Williams. See AUTHORS for Contributors.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 with many parts BSD <http://fontforge.org/license.html>. Please read LICENSE.
 Based on sources from 16:14 PST  9-Jan-2015-ML-D.
 Based on source from git with hash: 
no xdefs_filename!
TESTING: getPixmapDir:/usr/local/Cellar/fontforge/20141230/share/fontforge/pixmaps
TESTING: getShareDir:/usr/local/Cellar/fontforge/20141230/share/fontforge
TESTING: GResourceProgramDir:/usr/local/Cellar/fontforge/20141230/bin
trying default theme:/usr/local/Cellar/fontforge/20141230/share/fontforge/pixmaps/resources
fontforge.hasUserInterface!
PyFF_onAppClosing() cnt:1
else argv[i]:/Library/Fonts/Baskerville.ttc
SplineFontPieceMeal() going unhinted...
15-01-09 16:55:13 client beacon address: 10.172.126.83

Process 94072 stopped
* thread #1: tid = 0x85fd9c, 0x00007fff967d21b3 CoreFoundation`CFNumberGetValue + 131, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x00007fff967d21b3 CoreFoundation`CFNumberGetValue + 131
CoreFoundation`CFNumberGetValue + 131:
-> 0x7fff967d21b3:  movq   (%rbx), %rax
   0x7fff967d21b6:  testq  %rax, %rax
   0x7fff967d21b9:  je     0x7fff967d21fb            ; CFNumberGetValue + 203
   0x7fff967d21bb:  leaq   -0x17f0fdaa(%rip), %rcx   ; __CFConstantStringClassReferencePtr
(lldb) bt
* thread #1: tid = 0x85fd9c, 0x00007fff967d21b3 CoreFoundation`CFNumberGetValue + 131, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x00007fff967d21b3 CoreFoundation`CFNumberGetValue + 131
    frame #1: 0x0000000100a8bbbf libpangocairo-1.0.0.dylib`ct_font_descriptor_get_weight + 64
    frame #2: 0x0000000100a8b93b libpangocairo-1.0.0.dylib`_pango_core_text_font_description_from_ct_font_descriptor + 68
    frame #3: 0x0000000100a8de74 libpangocairo-1.0.0.dylib`pango_cairo_core_text_font_describe_absolute + 15
    frame #4: 0x0000000100a8dcdb libpangocairo-1.0.0.dylib`pango_cairo_core_text_font_create_base_metrics_for_context + 243
    frame #5: 0x0000000100a87c0e libpangocairo-1.0.0.dylib`_pango_cairo_font_get_metrics + 359
    frame #6: 0x00000001003393e5 libgdraw.5.dylib`_GXPDraw_DoText8 + 232
    frame #7: 0x00000001002f3cc9 libgdraw.5.dylib`GDrawGetText8Bounds + 86
    frame #8: 0x00000001000c62a6 libfontforgeexe.2.dylib`v_e_h + 4370
    frame #9: 0x00000001002f0779 libgdraw.5.dylib`_GWidget_Container_eh + 227
    frame #10: 0x0000000100335fea libgdraw.5.dylib`GXDrawSendExpose + 180
    frame #11: 0x0000000100331683 libgdraw.5.dylib`GXDrawScroll + 311
    frame #12: 0x00000001000c5161 libfontforgeexe.2.dylib`FVScroll + 200
    frame #13: 0x0000000100320cc8 libgdraw.5.dylib`GScrollBarChanged + 140
    frame #14: 0x0000000100320499 libgdraw.5.dylib`gscrollbar_mouse + 559
    frame #15: 0x00000001002f09c8 libgdraw.5.dylib`_GWidget_Container_eh + 818
    frame #16: 0x00000001002f1220 libgdraw.5.dylib`_GWidget_TopLevel_eh + 1052
    frame #17: 0x0000000100335133 libgdraw.5.dylib`dispatchEvent + 5725
    frame #18: 0x000000010033292c libgdraw.5.dylib`GXDrawEventLoop + 65
    frame #19: 0x000000010015ac0a libfontforgeexe.2.dylib`fontforge_main + 6304
    frame #20: 0x00007fff954285fd libdyld.dylib`start + 1
    frame #21: 0x00007fff954285fd libdyld.dylib`start + 1
(lldb) 


If I can provide any more information to help track this down,
please let me know.

Many thanks,
Tyler

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