Use gtk_clipboard_request_contents() instead of gtk_selection_convert() for paste on GTK
Use gtk_clipboard_request_contents() instead of gtk_selection_convert() for paste on GTK

When compiling Scintilla on OS X with GTK2 backend (and GTK2 with Quartz backend),
gtk_selection_convert() doesn't work. GtkClipboard seems to work fine though.

timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla,timonwong/foo_uie_wsh_panel_mod.scintilla