Multi_key sequence forLatin capital U with macron

Thank you for your bug. Is there any reference documenting what characte should be create when using a sequence? Maybe you could open this bug on bugzilla.gnome.org they will better placer on wheter that's a design choice or a bug

The only documentation I can find is the comments in the source code which I have quoted above. That is why I am creating the documentation on the Ubuntu wiki.
As best as I can understand the actual code it would appear that the fix would be to change the unicode string to produce the correct characters eg
/gtk/gtkimcontextsimple.c (gtk+ version 2.10.7)

change lines 635 and 639 from 0x016B to 0x016A

Source line 635
  GDK_Multi_key, GDK_U, GDK_minus, 0, 0, 0x016A, /* LATIN_CAPITAL_LETTER_U_WITH_MACRON */

Source line 639
  GDK_Multi_key, GDK_U, GDK_underscore, 0, 0, 0x016A, /* LATIN_CAPITAL_LETTER_U_WITH_MACRON */

This would make the comments, the sense of the Key sequence using upper case U and the unicode value all in agreement and coherent with similar codes in the file.

Yes it would be best to open the bug upstream with Gnome but I already have a login with Ubuntu whereas I would have to open yet another account and forgettable password to do the same with Gnome.

Now reported upstream as bug 449906
http://bugzilla.gnome.org/show_bug.cgi?id=449906

Thank you for sending the bug to the GNOME bugzilla

The bug has been fixed upstream now

gtk+2.0 (2.12.0-0ubuntu1) gutsy; urgency=low

  * New upstream version:
    GtkTooltips
    - All widgets have been ported to the new tooltips code
    - Tooltips are disabled in touchscreen mode
    GtkBuilder
    - Support custom tabs in GtkPrintUnixDialog
    Bugs fixed:
    - 459561 critical warnings with custom tooltips
    - 461648 GdkWindowQueueItem::serial overflow
    - 463773 Openoffice and flash run into a deadlock when used with KDE
    - 468801 thunar segfaults when selecting targa image (LP: #127574)
    - 473441 [patch] Ungrab windows when gdk_window_destroy() is calle...
    - 473954 gnome-background-properties: crash on drag-n-drop to "Add...
      (LP: #128931)
    - 461945 totem outputs errors in terminal (LP: #129438, #130329)
    - 348493 _gdk_quartz_copy_to_image needs implementing for pixmaps
    - 405868 Missing implementation of gdk_window_get_geometry()
    - 441219 Do not allow moving cursor to separators
    - 447214 rename the tips_data_list field back
    - 451202 New tooltips API has too long default timeout (LP: #133919)
    - 451397 Use new tooltip API in gtk+
    - 452225 check and option mark drawing is a mess of inconsistency
    - 457642 tooltips on notebook's tab labels
    - 458088 Improve mouse cursor for paned widgets
    - 458102 GtkScrolledWindow doesn't redraw when gtk-scrolled-window...
    - 458280 remove set-toolip handler from menutoolbutton
    - 458298 broken cursor movement with inline selection
    - 459459 Missing implementation of gdk_window_set_decorations() an...
    - 459515 gtk_menu_key_press() buglets
    - 459566 update testtooltips
    - 459667 Missing implementation of gdk_window_set_keep_above and g...
    - 460272 GtkFrame publishes incorrect defaults for "label-xalign"
    - 460534 No expose events if input swamps main loop with scrolled ...
    - 461225 gtk_tree_view_set_tooltip_cell() documentation: cell
     -463907 'Recent Documents' is broken in gnome-panel 2.19.5 (LP: #131266)
     -464528 gdk_rectangle_union() and gdk_rectangle_intersect() shoul...
    - 465039 "keynav-failed" signal not emitted when treeview has just...
    - 467003 tooltips do not pick up theme changes
    - 467117 Documentation for the GtkPaned key binding signals
    - 467414 gtkcupsutil.c won't build with cups 1.3
    - 468055 Incorrect compose mapping for capital U with macron (LP: #113721)
    - 468245 Tooltip timer doesn't get reset when mouse leaves into ot...
      (LP: #135076)
    - 469214 Recently used blocks side-panel browsing until loaded
    - 469374 menu accelerators don't work
    - 469395 make dist failure
    - 471132 Highlighting a suggestion with the keyboard changes the U...
      (LP: #134304)
    - 471215 Cursor drawing broken
    - 472974 gtk-builder-convert doesn't set correctly the tab label f...
    - 472981 make gtk-builder-convert not remove some empty properties
    - 356630 Print to file dialog suggests "output.pdf" even for ps ou...
    - 447883 PATCH Documentation about SVN in HACKING and README.cvs-c...
    - 459340 GtkContainer API documentation refers deprecated gtk_widg...
    - 459732 build system: cups detection with only cups-config might ...
    - 460207 there a...