Fix unnecessary inclusion of glibmm/threads.h. This can be resolved by ensuring that glibmm headers always preceed glib.h headers. Same applies with gtkmm/gtk+ etc
Improve keyboard navigation in LPE dialog.
Adding inclusion of config.h where needed for threads.h check.
Added configure/ifdef guards to only bring in the needed #include if glibmm has it.
Correct to compile against recent gtkmm, including updated macports versions. Fixes bug #1179338.
Fix false gtk deprecation warnings from gtkmm headers
Fix for 927074 : resize buttons, and add on tree double click
Fix for 927074 : Simplify Path Effects dialog