MERGE crashes when clicking on "check alignment"

[epruesse]

/home/epruesse/arb/gtk/lib/libCORE.so(GBK_dump_backtrace(_IO_FILE*, char const*)+0x39)[0x7faf7b2a2efa]
/home/epruesse/arb/gtk/lib/libARBDB.so(gb_search(GBCONTAINER*, char const*, GB_TYPES, int)+0x66)[0x7faf7b626f6b]
/home/epruesse/arb/gtk/lib/libARBDB.so(GB_search(GBDATA*, char const*, GB_TYPES)+0x33)[0x7faf7b6274e1]
/home/epruesse/arb/gtk/lib/libARBDB.so(GBT_read_string(GBDATA*, char const*)+0x3c)[0x7faf7b66f91b]
/home/epruesse/arb/gtk/lib/libAWT.so(AWT_alignment_selection::fill()+0x5f)[0x7faf7b020f6f]
/home/epruesse/arb/gtk/lib/libWINDOW.so(AW_selection::refresh()+0x2f)[0x7faf7ad130b7]
/home/epruesse/arb/gtk/lib/libAWT.so(awt_create_selection_list_on_alignments(GBDATA*, AW_window*, char const*, char const*)+0x9c)[0x7faf7b01cfac]

GTK version, launched from within ARB

[westram]

• works in trunk
• ok in [10035]; broken by [10042]
  • non-compiling involved revisions: [10036]
  • diff:branches/gtk_only@10035:10042

[westram]

cannot reproduce any more

[westram]

of #558

• still broken in [12403]; fixed by [12404]
  • diff:branches/gtk_only@12403:12404