Still occurs ( c0d13df8537eade30e4781f2887caa808bbea440 ).
The memleak happens while cutting a single obstacle (the more you cut, the 
bigger the leak).

updated stacktrace:

Direct leak of 48 byte(s) in 2 object(s) allocated from:
    #0 0x4c36a1 in __interceptor_calloc 
/home/matthias/LLVM/LLVM_pure/stage_2/llvm/projects/compiler-
rt/lib/asan/asan_malloc_linux.cc:66:3
    #1 0x69cee5 in MyMalloc 
/home/matthias/vcs/git/freedroid/src/text_public.c:68:14
    #2 0x71ab4a in level_editor_copy_selection 
/home/matthias/vcs/git/freedroid/src/lvledit/lvledit_tool_select.c:992:8
    #3 0x722678 in level_editor_cut_selection 
/home/matthias/vcs/git/freedroid/src/lvledit/lvledit_tool_select.c:1189:2
    #4 0x5e6496 in input_key 
/home/matthias/vcs/git/freedroid/src/keyboard.c:749:4
    #5 0x5e37ce in input_key_event 
/home/matthias/vcs/git/freedroid/src/keyboard.c:806:21
    #6 0x5e37ce in input_key_press 
/home/matthias/vcs/git/freedroid/src/keyboard.c:823
    #7 0x5bf9a3 in input_handle 
/home/matthias/vcs/git/freedroid/src/input.c:119:4
    #8 0x6fdb96 in leveleditor_process_input 
/home/matthias/vcs/git/freedroid/src/lvledit/lvledit_input.c:186:2
    #9 0x6e1e47 in LevelEditor 
/home/matthias/vcs/git/freedroid/src/lvledit/lvledit.c:282:3
    #10 0x60fc02 in main /home/matthias/vcs/git/freedroid/src/main.c:183:4
    #11 0x7f627040d57f in __libc_start_main (/lib64/libc.so.6+0x2057f)