[Bug 57704] gnome-typing-monitor leaks memory on each screen capture

[Simon Law]

Public bug reported:

Each time gnome-typing-monitor says "Take a break!", it does a screen capture.
And each time it does a screen capture, it leaks memory.  I know this because valgrind told me:

==3394== 178,200 bytes in 253 blocks are possibly lost in loss record 174 of 176
==3394==    at 0x401F548: memalign (vg_replace_malloc.c:332)
==3394==    by 0x401F5A2: posix_memalign (vg_replace_malloc.c:386)
==3394==    by 0x456720C: (within /usr/lib/libglib-2.0.so.0.1200.2)
==3394==    by 0x4567CA3: g_slice_alloc (in /usr/lib/libglib-2.0.so.0.1200.2)
==3394==    by 0x4567DDD: g_slice_alloc0 (in /usr/lib/libglib-2.0.so.0.1200.2)
==3394==    by 0x44F0015: g_type_create_instance (in /usr/lib/libgobject-2.0.so.0.1200.2)
==3394==    by 0x44D72C0: (within /usr/lib/libgobject-2.0.so.0.1200.2)
==3394==    by 0x44D588D: g_object_newv (in /usr/lib/libgobject-2.0.so.0.1200.2)
==3394==    by 0x44D63C6: g_object_new_valist (in /usr/lib/libgobject-2.0.so.0.1200.2)
==3394==    by 0x44D64C6: g_object_new (in /usr/lib/libgobject-2.0.so.0.1200.2)
==3394==    by 0x4485A73: gdk_pixbuf_new_from_data (in /usr/lib/libgdk_pixbuf-2.0.so.0.1000.1)
==3394==    by 0x4483F4C: gdk_pixbuf_copy (in /usr/lib/libgdk_pixbuf-2.0.so.0.1000.1)

Reproduction steps:
1. Open top and sort by memory usage.  Note the usage for gnome-typing-monitor.
2. Tell gnome-typing-monitor to "Take a break"
3. Postpone the break.
4. Repeat steps 2 and 3 a couple of times.
5. Note the memory usage for gnome-typing-monitor.

Expected results:
gnome-typing-monitor does not take up significantly more memory each time.

Actual results:
It grows by a few megabytes each time it greys out the screen.

** Affects: control-center (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

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gnome-typing-monitor leaks memory on each screen capture
https://launchpad.net/bugs/57704