2005-12-05 Matthias Clasen <mclasen@redhat.com>
* gtk/gtktreeview.c (gtk_tree_view_key_press): Free new_event
after sending it to the search entry. (#323209, Crispin Flowerday)
2005-12-02 Michael Natterer <mitch@imendio.com>
* gtk/gtkmenu.c: applied modified patch from maemo-gtk which
adds a "horizontal-padding" style property. Fixes bug #323036.
2005-12-01 Michael Natterer <mitch@imendio.com>
Merged modified patch from maemo-gtk that allows to disable
toolbar animations. Addresses bug #142582.
* gtk/gtksettings.c: added boolean property "gtk-enable-animations".
(patch from Christian Neumair)
* gtk/gtktoolbar.c: don't animate toolbar changes if the settings
property is FALSE. Replaced the individual "notify::foo"
connections to GtkSettings by a single "notify" callback and
dispatch internally.
2005-11-29 Matthias Clasen <mclasen@redhat.com>
Properly handle model changes in GtkTreeSelection: (#322569,
Milosz Derezynski)
* gtk/gtktreeselection.c (gtk_tree_selection_selected_foreach):
Get a reference to the model, and stop the iteration if the model
of the treeview is changed on the way.
* gtk/gtktreeprivate.h:
* gtk/gtktreeselection.c (_gtk_tree_selection_emit_changed): New
private function to emit the GtkTreeSelection::changed signal.
* gtk/gtktreeview.c (gtk_tree_view_set_model): Call
_gtk_tree_selection_emit_changed() when the model changes.
2005-11-28 Federico Mena Quintero <federico@ximian.com>
Fixes the critical warnings from bug #317999, thus fixing the bug
completely:
* gtk/gtkfilechooserdefault.c
(gtk_file_chooser_default_get_paths): In SELECT_FOLDER mode,
use _gtk_file_chooser_get_current_folder_path() instead of fetching the
impl->current_folder directly. The latter may be null if we are
in RELOAD_NONE state.
2005-11-28 Federico Mena Quintero <federico@ximian.com>
Fix bug #321560, based on a patch by Bogdan Nicula (bogdanni@hotmail.com):
* gtk/gtkfilechooserdefault.c (up_folder_handler): Don't add the
current_folder to the pending select paths here; the path bar will
give it to us now.
(path_bar_clicked): Add the child_path to the pending select paths
here.
(show_and_select_paths): Don't filter out folders.
(show_and_select_paths): Don't take separate arguments for
only_one_path and multiple paths.
* tests/autotestfilechooser.c (test_folder_switch_and_filters):
New test about preserving the filters when we change folders.
2005-11-28 Matthias Clasen <mclasen@redhat.com>
* gtk/gtkscale.c (_gtk_scale_format_value): Insert an LRM, to prevent
-20 to come out as 20- in RTL locales. (#322571, Tze'ela Hebron)
2005-11-28 Matthias Clasen <mclasen@redhat.com>
* gtk/gtkiconview.c (update_text_cell, update_pixbuf_cell): Correctly
handle the cell list and indices into it. (#321856)
2005-11-28 Matthias Clasen <mclasen@redhat.com>
* gtk/gtktooltips.c (gtk_tooltips_timeout): Set timer_tag to 0 when
the timeout is done. (#322291, Jean-Yves Lefort)
2005-11-28 Matthias Clasen <mclasen@redhat.com>
* gtk/gtkfilechooserdefault.c (shortcuts_key_press_event_cb): Make
F2 work for renaming bookmarks. (#320822, Jaap A. Haitsma, patch
by Paolo Borelli)
2005-11-28 Tor Lillqvist <tml@novell.com>
* gdk/win32/gdkwindow-win32.c (gdk_window_set_urgency_hint):
Implement the conditional use of FlashWindowEx() properly for MSVC
compilations. The code was confusingly assuming that if compiled
with a "new" compiler, it will only be run on "new" Windows
versions. We want it to run on "old" versions, too, even if
compiled with a "new" compiler. There are two orthogonal issues:
whether the compiler defines the necessary API in its headers, and
whether it is present at run-time. (#318077)
2005-11-28 Tor Lillqvist <tml@novell.com>
* gtk/gtkcalendar.c (gtk_calendar_init): Use GetLocaleInfo() on
Windows to get the localized weekday and month names. strftime()
in the Microsoft C library returns strings in the default codepage
for the locale of the process, not the system codepage. Thus
g_locale_to_utf8() isn't useable on the return value from
strftime(). (#322603)
2005-11-27 Matthias Clasen <mclasen@redhat.com>
Fix two memory handling problems in GtkTreeView: (#322350,
Søren Sandmann)
* gtk/gtktreeview.c (gtk_tree_view_destroy)
(gtk_tree_view_set_model): Remove all references to nodes in
the old model.
(gtk_tree_view_real_collapse_row): Unmark expanded_collapsed_node
before removing the children.
2005-11-27 Tor Lillqvist <tml@novell.com>
Once again rework Win32 window decoration code. Doesn't break
#104514. The dialogs in gtk-demo now have the same decorations and
behaviour as on X11. Tried to fix#322516 but it seems very hard
to make the trivial sample program there behave as expected. OTOH,
simply moving the gtk_window_decorate() call in the #322516 sample
program after the call to gtk_widget_show() helps...
* gdk/win32/gdkwindow-win32.c (set_or_clear_style_bits): Revert to
the correct semantics. Each call to gdk_window_set_decorations()
which calls this function is supposed to affect all decorations.
(decorate_based_on_hints): New function, looks at both geometry
hints and type hint and sets window decorations based on
that. Consolidate code from gdk_window_set_geometry_hints() and
gdk_window_set_type_hint() here.
(gdk_window_set_geometry_hints, gdk_window_set_type_hint): Call
decorate_based_on_hints().
2005-11-24 Michael Natterer <mitch@imendio.com>
* gtk/gtktoolbar.h (struct _GtkToolbar): changed two private guint
that used to hold signal handler IDs to two guint of padding.
* gtk/gtktoolbar.c (struct _GtkToolbarPrivate): added them as
gulong here.
(gtk_toolbar_screen_changed): changed accordingly.
2005-11-23 Behdad Esfahbod <behdad@gnome.org>
* configure.in (enable_explicit_deps): Fix typo when checking
libtool config deplibs_check_method. Moreover, enable explicit
deps if we get anything other than pass_all from libtool. (part of
#318750)
2005-11-23 Matthias Clasen <mclasen@redhat.com>
* gtk/updateiconcache.c (write_csource): Don't create a big
string, since Visual C++ doesn't like strings longer than 64k.
(#322238, Kazuki IWAMOTO
2005-11-23 Michael Natterer <mitch@imendio.com>
* gtk/gtkrc.c (gtk_rc_reset_widgets): don't leak all toplevel
windows on other screens (correctly remove all temporary
references).
2005-11-23 Michael Natterer <mitch@imendio.com>
Added symbolic themable colors. Patch is a merged version of
proposals from Matthias and maemo-gtk. Fixes bug #114355.
* configure.in: require glib >= 2.9.1 for refcountable hashtables.
* gtk/gtksettings.c: added property "color-scheme" which is a
string defining colors like "foreground:black\nbackground:grey".
Automatically provide a name->GdkColor hash table mapping for the
color scheme.
* gtk/gtkrc.[ch]: added list of color hashes that works like the
list of icon factories. Append the color scheme hash from
GtkSettings if it exists. Extended gtkrc syntax to allow defining
and referencing of logical colors. Also allow to modulate colors
in gtkrc by using arbitrary expressions of mix(), shade(),
lighter() and darker(). Added internal function
_gtk_rc_style_get_color_hashes().
* gtk/gtkstyle.[ch]: keep a private list of color hashes around.
Get the list from _gtk_rc_style_get_color_hashes(). Export
internal function _gtk_style_shade() (used by above color
expressions). Added public API gtk_style_lookup_color() which
looks up a logical color by name.
* gtk/gtk.symbols: add gtk_style_lookup_color
* tests/testgtkrc: use symbolic colors for making
the scrollbars red.
2005-11-22 Michael Natterer <mitch@imendio.com>
Made button-press timeouts which work like key repeat timeouts
configurable. Addresses bug #142582:
* gtk/gtksettings.c: added properties "gtk-timeout-initial" and
"gtk-timeout-repeat" which defalt to 200/20 (ms).
Use the values from GtkSettings instead of hardcoding them
(the repeat value is either taken as-is for fast repeat or
multiplied by 5 for slow repeat). Changed all places to use these
two standard initial/repeat timings:
* gtk/gtkcalendar.c (unchanged 200/20)
* gtk/gtknotebook.c (unchanged 200/100)
* gtk/gtkpathbar.c (changed from 300/150 to 200/100)
* gtk/gtkrange.c (changed from 250/100 to 200/100)
* gtk/gtkspinbutton.c (unchanged 200/20)
2005-11-18 Matthias Clasen <mclasen@redhat.com>
Fix crashes in connection with pathbar scrolling (#321560,
Bogdan Nicula)
* gtk/gtkpathbar.c (gtk_path_bar_update_slider_buttons):
Stop scrolling when desensitising slider buttons.
(gtk_path_bar_scroll_timeout, gtk_path_bar_slider_button_press):
And use it here.
* gtk/gtkpathbar.h (struct _GtkPathBar): Add a separate
scrolling_down flag.
2005-11-18 Matthias Clasen <mclasen@redhat.com>
* gtk/gtkaction.c (disconnect_proxy): Disconnect the
sync callback for the visibility property. (#321761,
Philip Langdale)
2005-11-18 Matthias Clasen <mclasen@redhat.com>
Turn off input methods in invisible entries, since
they are confusing. (#317002, James Su)
* gtk/gtkentry.c (gtk_entry_set_visibility): Toggle input
methods if visibility changes.
(popup_targets_received): Don't show the input method
menu if the entry is invisible.
2005-11-16 Michael Natterer <mitch@imendio.com>
* gtk/gtkimage.c (animation_timeout): call
gtk_window_process_updates() so the animation keeps running even
if the main loop is busy with sources that eat a lot of cpu with
high priority. Fixes bug #321444.
(gtk_image_new_from_animation): document the fact that the
animation will stop running if the main loop is busy with sources
that have priorities higher than G_PRIORITY_DEFAULT.
* tests/testimage.c: added test case that shows an animation even
though a cpu-eating idle function is running.
2005-11-16 Michael Natterer <mitch@imendio.com>
* gdk/x11/gdkevents-x11.c (_gdk_events_uninit): new internal
function which destroys the display's event source. Also removes
the source from the global display_sources list and unrefs it.
* gdk/x11/gdkprivate-x11.h: declare the function.
* gdk/x11/gdkdisplay-x11.c (gdk_display_x11_dispose): call it
instead of half-destroying the source here.
2005-11-15 Michael Natterer <mitch@imendio.com>
* gdk/x11/gdkdisplay-x11.c (gdk_display_x11_finalize): destroy
display->xid_ht as late as possible (right before XCloseDisplay)
because it still needs to be around when the display's screens are
finalized. (#85715)
2005-11-12 Dom Lachowicz <cinamod@hotmail.com>
* modules/engines/ms-windows/msw_style.c: Bug #313627. Make win32
theme's handling of toolbars, handleboxes, and menubars more in-line
with Microsoft's IE style.
* modules/engines/ms-windows/*.c: Indentation cleanups
2005-11-12 Matthias Clasen <mclasen@redhat.com>
Make builtin icons work in gtk_window_set_icon_name()
(#321046, Maxim Udushlivy)
* gtk/gtkicontheme.c (insert_theme): Always insert the default
theme.
(ensure_valid_themes): Call _gtk_icon_theme_ensure_builtin_cache()
from here.
(theme_lookup_icon, find_builtin_icon): ...and not from here.
(gtk_icon_theme_lookup_icon): Remove an unncessary assert.
(gtk_icon_theme_get_icon_sizes): Also check builtin icons.
2005-11-12 Tor Lillqvist <tml@novell.com>
* gtk/gtkfilesystemwin32.c (filename_get_info): Don't hide
dotfiles, no such convention on Win32. Just hide files with the
hidden attribute. (#314627)
2005-11-11 Federico Mena Quintero <federico@ximian.com>
* gtk/gtkfilechooserdefault.c (shortcuts_insert_path): Do not
check whether the path is a folder. It is useful to bookmark
files as well (e.g. todo.txt), and this will also help
performance.
(shortcuts_add_bookmark_from_path): Likewise.
(shortcuts_activate_iter): Change folders or select files, as
appropriate.
2005-11-11 Federico Mena Quintero <federico@ximian.com>
* tests/autotestfilechooser.c (main): Use
g_log_set_default_handler() instead of explicitly setting a
handler for each domain.
2005-11-11 Federico Mena Quintero <federico@ximian.com>
* gtk/gtkfilechooserdefault.c (shortcuts_add_volumes): Only get
the base path of the volume if it is mounted.
2005-11-11 Michael Natterer <mitch@imendio.com>
Added per-stepper API for GtkRange's stepper sensitivity as
discussed in bug #321056:
* gtk/gtkenums.h: added GtkSensitivityType which can be
{ AUTO, ON, OFF }.
* gtk/gtkrange.[ch]: added properties "lower-stepper-sensitivity"
and "upper-stepper-sensitivity" and public getters/setters for
them. Changed stepper drawing to honor the new properties.
* gtk/gtk.symbols: added the new symbols.
2005-11-10 Matthias Clasen <mclasen@redhat.com>
* gtk/gtkcombobox.c: Add show-popup and hide-popup signals and
emit them when the popup is shown or hidden. (#162531, Tommi
Komulainen)
2005-11-10 Matthias Clasen <mclasen@redhat.com>
Don't corrupt odd keymaps (#316638, Kean Johnston)
* gdk/x11/gdkkeys-x11.c (set_symbol): Auxiliary function to
handle frobbing keymaps with odd numbers of syms/code.
* gdk/x11/gdkkeys-x11.c (update_keymaps): Use set_symbol() to
frob the keymap.
2005-11-10 Matthias Clasen <mclasen@redhat.com>
Improve navigation to parent folders. (#318444, Andrei Yurkevich)
* gtk/gtkpathbar.[hc]: Add a child_path argument to
the path_clicked signal.
* gtk/gtkfilechooserdefault.c (path_bar_clicked): Select the
child_path, if it is provided.
* gtk/marshalers.list (path_bar_clicked): Add the necessary
glue.
2005-11-10 Michael Natterer <mitch@imendio.com>
Applied patch from maemo-gtk that addresses many issues wrt
display migration and display closing (bug #85715).
* gdk/gdkdisplay.c (gdk_display_dispose): don't just set the
default display to NULL when it's closed. Instead set the most
recently opened display as new default (if one exists).
* gdk/gdkpango.c (on_renderer_display_closed): fixed signature
of this callback.
* gdk/gdkscreen.c (gdk_screen_dispose): check if the GCs still
exist before unrefing them.
* gdk/gdkwindow.c (_gdk_window_destroy_hierarchy): if the screen
is closed, allow destruction of the root window.
* gdk/x11/gdkdisplay-x11.c: moved some stuff from finalize() to
dispose(), free stuff that was leaked before.
* gdk/x11/gdkevents-x11.c (_gdk_x11_events_uninit_screen): check if
the xsettings_client still exists before destroying it.
* gdk/x11/gdkkeys-x11.c: added finalization and free the allocated
X resources.
* gdk/x11/gdkpixmap-x11.c: moved stuff from finalize() to new
dispose() implementation.
* gdk/x11/gdkscreen-x11.c: moved stuff from finalize() to
dispose() and check if it still exists before unrefing it. Set
their pointers to NULL/None *after* upchaining in dispose(),
because X11 implementations of members of the parent class still
need them for their own destruction.
* gdk/x11/gdkvisual-x11.c: removed finalize() implementation which
was g_error()ing when finalizing a visual.
* gtk/gtkclipboard.c (gtk_clipboard_finalize): don't use
get_clipboard_widget() because it would create the widget if it
doesn't exist. Use g_object_get_data() directly instead.
* gtk/gtktextdisplay.c (on_renderer_display_closed): fixed signature
of this callback.
Wed Nov 9 16:29:42 2005 Tim Janik <timj@imendio.com>
* gtk/gtkrange.c: patch from maemo-gtk that changes GtkRange
to render its arrows insensitive when the adjustment is in
its min or max position. this makes range arrow behaviour
consistent with spin button behaviour. (#321056)
2005-11-09 Tor Lillqvist <tml@novell.com>
* gdk/gdkinternals.h
* gdk/gdk.c (gdk_debug_keys[]): Add new GDK_DEBUG_DRAW flag to
the GdkDebugFlag enum.
* gdk/win32/gdkdrawable-win32.c: Use DRAW to trigger GDK_NOTEs in
this file instead of MISC. Now asking for MISC will give mainly
window manipulation debugging output.
2005-11-09 Tor Lillqvist <tml@novell.com>
* gdk/win32/gdkwindow-win32.c: Remove unnecessary includes.
(_gdk_win32_get_adjusted_client_rect): Remove this two-line
function which was used only in one place.
(get_outer_rect): Use _gdk_win32_adjust_client_rect().
(gdk_window_set_geometry_hints): If we have identical minimum and
maximum size hints, remove the resize and maximize
decorations/functions. (#104514)
If we have a maximum size hint, remove the maximize
decoration/function but ensure the resize decoration/function is
available. Otherwise ensure both resize and maximize
decorations/functions are there.
(set_or_clear_style_bits): Factored out common code from
gdk_window_set_decorations() and gdk_window_set_functions().
Hack the window style setting once more: Only touch the window
style bits corresponding to the GdkWMDecoration or GdkWMFunction
parameter bitmasks. Hopefully this finally is the correct thing to
do. We used to clear all other bits than those that were being
set, or set all other bits than those that were being cleared.
Take into account that adding or removing decorations leaves the
window's outer size unchanged, i.e., the client area's size and
position change. This is apparently not what we want, so change
also the window's (outer) position and size appropriately so that
the client area's position and size stay constant.
gtk-demo's color selector dialog is now non-resizable like on X11
(I tested with metacity in GNOME). Torn off menus are shrinkable
vertically but have a maximum size, and are not maximizable or
minimizable, like on X11.
(gdk_window_set_decorations, gdk_window_set_functions): Let
set_or_clear_decorations() do most of the job.
* gdk/win32/gdkprivate-win32.h: Remove declaration of
_gdk_win32_get_adjusted_client_rect().
2005-11-09 Tor Lillqvist <tml@novell.com>
* gdk/win32/gdkwindow-win32.h (struct _GdkWindowImplWin32)
* gdk/win32/gdkwindow-win32.c (gdk_window_impl_win32_init,
gdk_window_get_type_hint, gdk_window_get_type_hint): Store the
type hint. Implement gdk_window_get_type_hint() by just returning
the hint stored.
2005-11-09 Tor Lillqvist <tml@novell.com>
* gdk/win32/gdkwindow-win32.c (gdk_window_set_geometry_hints):
Remove code that has been permanently ifdeffed out for two years.
2005-11-08 Matthias Clasen <mclasen@redhat.com>
* gdk/gdkgc.c (gdk_gc_finalize): Unref tile and stipple when
finalizing a gc. (#320789, Nickolay V. Shmyrev)
2005-11-08 Matthias Clasen <mclasen@redhat.com>
* gdk/x11/gdkwindow-x11.c (gdk_window_set_icon_list): Ignore
icons if they would make the request large enough to cause
Xlib to loose the connection. (#320909, Claudio Saavedra)
2005-11-07 Matthias Clasen <mclasen@redhat.com>
* gtk/gtkpathbar.[hc]: Set focus-on-click to FALSE for all buttons.
Don't grab focus when a slider button is pressed, instead, use
a bit in the pathbar struct to determine whether to scroll up
or down. (#314486, Carlos Garnacho)
2005-11-07 Matthias Clasen <mclasen@redhat.com>
* gtk/gtkentrycompletion.c (_gtk_entry_completion_popup):
Don't popup the completions if the focus has already been
moved somewhere else. (#319914, Christian Persch)
2005-11-07 Matthias Clasen <mclasen@redhat.com>
* gtk/gtktoolitem.c (_gtk_tool_item_toolbar_reconfigured):
Raise the drag_window after reconfiguring the
toolbar. (#320803, Christian Persch)
2005-11-07 Tor Lillqvist <tml@novell.com>
* gdk/win32/gdkcursor-win32.c (pixbuf_to_hbitmaps_normal):
Correct the calculation of maskstride. (#320152, Peter Zelezny)
2005-11-06 Michael Natterer <mitch@imendio.com>
* gtk/Makefile.am (icons): fixed rule to actually create the
symlinks, erroring out if anything goes wrong.
2005-11-06 Tor Lillqvist <tml@novell.com>
* gtk/updateiconcache.c (build_cache): Can't rename a file if the
target exists on Win32. First rename the target temporarily, then
if the renaming of the source to target fails, restore the
original name for the target.
* gtk/Makefile.am: Use EXEEXT in the dependency on gtk-update-icon-cache.
2005-11-06 Tor Lillqvist <tml@novell.com>
(pixbuf_to_hbitmaps_alpha_winxp): Use an 1-bit mask bitmap,
like pixbuf_to_hbitmaps_normal().
(_gdk_win32_pixbuf_to_hicon_supports_alpha): Check
G_WIN32_IS_NT_BASED() first, so we can pretend being on Win9x by
setting the G_WIN32_PRETEND_WIN9X environment variable.
2005-11-06 Tor Lillqvist <tml@novell.com>
Make icon masks work on Win98 (#320152, Peter Zelezny)
* gdk/win32/gdkcursor-win32.c (create_color_bitmap): Take also a
parameter for the depth of the bitmap, so that this function can
be used to create 1-bit bitmaps, too.
(pixbuf_to_hbitmaps_normal): Create an 1-bit bitmap for the mask,
and initialize it properly.
2005-11-04 Matthias Clasen <mclasen@redhat.com>
Store builtin stock icons in an icon cache, instead of
populating a hash table with pixbufs at startup, to save both
memory and startup time.
* gtk/stock-icons/*: Reorganize the icons in a directory structure
suitable for gtk-update-icon-cache, and rename them to match the
stock ids.
* gtk/gtkiconcache.[hc]: Support non-mmapped icon caches, and
add _gtk_icon_cache_has_icon_in_directory().
* gtk/updateiconcache.c: Support a --source <VARIABLE> argument
to store the contents of the icon cache in a C header.
* gtk/gtkbuiltincache.h: Generated private header which contains
the icon cache for the builtin icons.
* gtk/gtkicontheme.c: Create a GtkIconCache for the builtin
icons, and use that in addition to the hash table whenever
builtin icons are searched.
* gtk/gtkiconfactory.c: Add GTK_ICON_SOURCE_STATIC_ICON_NAME and
use it for static stock ids.
(get_default_icons): Don't add the builtin
icons to the icon theme, just register the stock ids.
(render_fallback_image): Take the fallback image out of the
builtin icon cache.
* gtk/Makefile.am: Remove stock-icons from SUBDIRS and add
the necessary machinery to rebuild gtkbuiltincache.h.
2005-11-04 Michael Natterer <mitch@imendio.com>
* gtk/gtkrc.c (gtk_rc_reparse_all_for_settings): applied patch
from maemo-gtk that changes the mtime check for rc files from
'>' to '!=', otherwise theme changes go unnoticed when turning
back the clock (Tommi Komulainen).
2005-11-03 Tor Lillqvist <tml@novell.com>
* gdk/win32/gdkcursor-win32.c: As there is only one GdkDisplay in
the Win32 backend, check that GdkDisplay* parameters are equal to
_gdk_display instead of using the unnecessarily general
GDK_IS_DISPLAY().
2005-11-03 Tor Lillqvist <tml@novell.com>
* gdk/win32/gdkcursor-win32.c (pixbuf_to_hbitmaps_alpha_winxp):
Rename the variables for the color bitmap to have "color" in their
name, for similarity with pixbuf_to_hbitmaps_normal(). Create a
color bitmap for the mask, too, instead of creating a b&w bitmap
with CreateBitmap(). Set up the mask bitmap's contents, ones for
those pixels in the color bitmap where the alpha is zero, zero for
other pixels. We used to use an unitialized mask bitmap! This
meant that icons and cursors created presumably worked more or
less by accident. Totally blank icons with zero alpha everywhere
(as used by gtktrayicon.c) definitely did not work as expected.
2005-11-03 Tor Lillqvist <tml@novell.com>
* gtk/Makefile.am: Include gtkstatusicon.c on all platforms.
* gtk/gtkstatusicon.c: Implement for Win32. Use code from
gtktrayicon-win32.c as applicable. (gtktrayicon-win32.c is not
necessary and can be removed from CVS. It has never been mentioned
in gtk/Makefile.am.) No tray icon widget, GtkImage or GtkTooltips
are used on Win32. One label widget is used (but never shown) as
gtk_widget_render_icon() needs a widget.
Ifdefs used as necessary in several places. It might be cleaner to
split out the backend-specific parts to separate files, or at
least collect them into separate blocks in the file.
(wndproc): New function. Window procedure to monitor mouse events
in the system tray icon. Call gtk_status_icon_button_press() as
needed.
(create_tray_observer): New function. Creates a hidden window that
only serves as a tray icon message observer.
