使用 oxygen-gtk2 主題時，偏好設定崩潰

[hyslion]

從 405dc18 這個 commit 開始，
使用 oxygen-gtk2 主題時，Preference 內的 Site Settings 分頁會使得程式崩潰。

The program 'pcmanx' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
  (Details: serial 13294 error_code 8 request_code 62 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

以下是根據提示，利用 break gdk_x_error() 讀取 backtrace 時所產生的輸出

#0  gdk_x_error (display=0x7a7e20, error=0x7fffffffc4b0) at gdkmain-x11.c:458
#1  0x00007ffff60658fd in _XError () from /usr/lib/libX11.so.6
#2  0x00007ffff6062867 in ?? () from /usr/lib/libX11.so.6
#3  0x00007ffff6062925 in ?? () from /usr/lib/libX11.so.6
#4  0x00007ffff60638d0 in _XReply () from /usr/lib/libX11.so.6
#5  0x00007ffff60498cd in XGetWindowProperty () from /usr/lib/libX11.so.6
#6  0x00007ffff75145f0 in IA__gdk_window_get_type_hint (window=0xc87360) at gdkwindow-x11.c:2117
#7  0x00007fffecffba68 in Oxygen::Gtk::gdk_window_nobackground (window=window@entry=0xc87360)
    at /home/hyslion/pkgbuild/oxygen-gtk2/src/oxygen-gtk2-1.4.5/src/oxygengtkutils.cpp:174
#8  0x00007fffed0757c0 in Oxygen::draw_flat_box (style=0xd28be0, window=0xc87360, state=13377632, shadow=GTK_SHADOW_NONE, 
    clipRect=0x7ffff7b2752c, widget=0xdaf598, detail=0x7ffff7b2752c "base", x=0, y=0, w=668, h=414)
    at /home/hyslion/pkgbuild/oxygen-gtk2/src/oxygen-gtk2-1.4.5/src/oxygenstylewrapper.cpp:153
#9  0x00007ffff7918e62 in gtk_paint_flat_box () from /usr/lib/libgtk-x11-2.0.so.0
#10 0x00007ffff79d0f1b in gtk_window_paint (widget=widget@entry=0xcc2060, area=area@entry=0x7fffffffcf84) at gtkwindow.c:6625
#11 0x00007ffff79d0f6c in gtk_window_expose (widget=0xcc2060, event=0x7fffffffcf70) at gtkwindow.c:6634
#12 0x00007ffff789184f in _gtk_marshal_BOOLEAN__BOXED (closure=0x84f140, return_value=0x7fffffffcb60, n_param_values=<optimized out>, 
    param_values=0x7fffffffcc10, invocation_hint=<optimized out>, marshal_data=0x7ffff79d0f20 <gtk_window_expose>) at gtkmarshalers.c:86
#13 0x00007ffff6ace3d8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#14 0x00007ffff6adfb1b in ?? () from /usr/lib/libgobject-2.0.so.0
#15 0x00007ffff6ae7719 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#16 0x00007ffff6ae7d02 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#17 0x00007ffff79c4a3c in gtk_widget_event_internal (widget=0xcc2060, event=0x7fffffffcf70) at gtkwidget.c:5010
#18 0x00007ffff788ee18 in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#19 0x00007ffff74eb3bf in _gdk_window_process_updates_recurse (window=window@entry=0xc87360, expose_region=expose_region@entry=0xdd2f90)
    at gdkwindow.c:5443
#20 0x00007ffff7518b65 in _gdk_windowing_window_process_updates_recurse (window=window@entry=0xc87360, region=region@entry=0xdd2f90)
    at gdkwindow-x11.c:5643
#21 0x00007ffff74e7e38 in gdk_window_process_updates_internal (window=0xc87360) at gdkwindow.c:5610
#22 0x00007ffff74e8738 in IA__gdk_window_process_all_updates () at gdkwindow.c:5716
#23 0x00007ffff7812bd1 in gtk_container_idle_sizer (data=<optimized out>) at gtkcontainer.c:1360
#24 0x00007ffff74c8487 in gdk_threads_dispatch (data=0xdb0ae0) at gdk.c:512
#25 0x00007ffff67fea65 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#26 0x00007ffff67fedc8 in ?? () from /usr/lib/libglib-2.0.so.0
#27 0x00007ffff67ff08a in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#28 0x00007ffff7815c23 in IA__gtk_dialog_run (dialog=0xcc2060) at gtkdialog.c:1094
#29 0x0000000000431a5f in CDialog::ShowModal (this=0x88f030) at dialog.cpp:68
#30 0x0000000000437439 in CMainFrame::OnPreference (mitem=0x9d69c0, _this=0x883e70) at mainframe.cpp:1155
#31 0x00007ffff6ace3d8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#32 0x00007ffff6adfd5d in ?? () from /usr/lib/libgobject-2.0.so.0
#33 0x00007ffff6ae7a49 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#34 0x00007ffff6ae7d02 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#35 0x00007ffff77d1460 in _gtk_action_emit_activate (action=0x9d69c0) at gtkaction.c:795
#36 0x00007ffff6ace3d8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#37 0x00007ffff6adf577 in ?? () from /usr/lib/libgobject-2.0.so.0
#38 0x00007ffff6ae7a49 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#39 0x00007ffff6ae7d02 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#40 0x00007ffff79c3876 in IA__gtk_widget_activate (widget=widget@entry=0x89a530) at gtkwidget.c:5041
#41 0x00007ffff78a30bd in IA__gtk_menu_shell_activate_item (menu_shell=0x998220, menu_item=0x89a530, force_deactivate=<optimized out>)
    at gtkmenushell.c:1276
#42 0x00007ffff78a343b in gtk_menu_shell_button_release (widget=0x998220, event=<optimized out>) at gtkmenushell.c:703
#43 0x00007ffff789184f in _gtk_marshal_BOOLEAN__BOXED (closure=0x84ff70, return_value=0x7fffffffdcb0, n_param_values=<optimized out>,
    param_values=0x7fffffffdd60, invocation_hint=<optimized out>, marshal_data=0x7ffff7898c10 <gtk_menu_button_release>) at gtkmarshalers.c:86
#44 0x00007ffff6ace3d8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#45 0x00007ffff6adfb1b in ?? () from /usr/lib/libgobject-2.0.so.0
#46 0x00007ffff6ae7719 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#47 0x00007ffff6ae7d02 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#48 0x00007ffff79c4a3c in gtk_widget_event_internal (widget=0x998220, event=0xc31990) at gtkwidget.c:5010
#49 0x00007ffff789054a in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0
#50 0x00007ffff788f014 in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#51 0x00007ffff75037bc in gdk_event_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>)
    at gdkevents-x11.c:2403
#52 0x00007ffff67feb84 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#53 0x00007ffff67fedc8 in ?? () from /usr/lib/libglib-2.0.so.0
#54 0x00007ffff67ff08a in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#55 0x00007ffff788e59c in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#56 0x000000000042c893 in main (argc=2, argv=0x7fffffffe3b8) at pcmanx_gtk2.cpp:190

同時也能觀察到 UAO 的下拉式選單只被繪出了一半，接著就崩潰了。而將該選單移除後就不會有問題了。

這個問題似乎只在使用 oxygen-gtk2 作為主題的時候發生，換別的主題就不會了，所以也可能是 oxygen-gtk2 的 bug。只是乍看之下 405dc18 好像沒有直接影響，沒有套用該 patch 的分支（像 master）就算用 oxygen-gtk2 也不會有問題。為什麼會產生這個錯誤呢？希望在這方面有心得的前輩可以幫忙解惑，謝謝！

[kidwm]

其實我很想問 @fourdollars 為什麼我們需要兩種 UAO 版本…

我記得 Windows 版的並沒有這個設定。

[fourdollars]

因為我不曉得哪一個才是標準啊...

[fourdollars]

我是參考 http://moztw.org/docs/big5/ 上面的資料實作的，資料上面就是列了兩種。

[kidwm]

我記得兩版差異不是非常小嗎？
是不是看看 Windows 版用的是哪個，我們設成預設值就好？

[fourdollars]

提醒一下， UAO 是針對 Big5 的，但是其實 pcmanx-gtk2 並不只是只有支援 Big5 喔，要改成預設值需要考慮一下會不會影響非 Big5 的部份。

[kidwm]

是啊，我指的是有開 UAO 時的預設值。
應該也只有在 big5 底下生效吧。

[kidwm]

@hyslion 話說你確定在那個 commit 之前的就沒有這個問題？

[kidwm]

Ref #58