Bug#555030: GDK_BUTTON?_MOTION_MASK appears to be broken

[Ben Hutchings]

Package: libgtk2.0-0
Version: 2.18.3-1
Severity: important

DVswitch has a custom widget which supports drag selection and
extension, so its event mask is:

    GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK
    | GDK_BUTTON1_MOTION_MASK | GDK_BUTTON2_MOTION_MASK

It also adds and removes modal grab as the mouse button is pressed and
released, so that it can detect the end of a drag outside the window.

Today I found that this widget no longer receives motion events, only
press and release events.  Adding GDK_POINTER_MOTION_MASK brings back
motion events, but I do not want to receive them while no buttons are
pressed!  This is a regression from 2.16, possibly resulting from the
extensive changes to support XInput.

Ben.

-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: i386 (x86_64)

Kernel: Linux 2.6.31-trunk-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages libgtk2.0-0 depends on:
ii  libatk1.0-0            1.28.0-1          The ATK accessibility toolkit
ii  libc6                  2.10.1-5          GNU C Library: Shared libraries
ii  libcairo2              1.8.8-2           The Cairo 2D vector graphics libra
ii  libcups2               1.4.1-5           Common UNIX Printing System(tm) - 
ii  libfontconfig1         2.6.0-4           generic font configuration library
ii  libfreetype6           2.3.11-1          FreeType 2 font engine, shared lib
ii  libglib2.0-0           2.22.2-2          The GLib library of C routines
ii  libgnutls26            2.8.4-2           the GNU TLS library - runtime libr
ii  libgssapi-krb5-2       1.7dfsg~beta3-1   MIT Kerberos runtime libraries - k
ii  libgtk2.0-common       2.18.3-1          Common files for the GTK+ graphica
ii  libjasper1             1.900.1-6         The JasPer JPEG-2000 runtime libra
ii  libjpeg62              6b-15             The Independent JPEG Group's JPEG 
ii  libpango1.0-0          1.26.0-1          Layout and rendering of internatio
ii  libpng12-0             1.2.40-1          PNG library - runtime
ii  libtiff4               3.9.1-1           Tag Image File Format (TIFF) libra
ii  libx11-6               2:1.2.2-1         X11 client-side library
ii  libxcomposite1         1:0.4.0-4         X11 Composite extension library
ii  libxcursor1            1:1.1.9-1         X cursor management library
ii  libxdamage1            1:1.1.1-4         X11 damaged region extension libra
ii  libxext6               2:1.0.4-1         X11 miscellaneous extension librar
ii  libxfixes3             1:4.0.3-2         X11 miscellaneous 'fixes' extensio
ii  libxi6                 2:1.2.1-2         X11 Input extension library
ii  libxinerama1           2:1.0.3-2         X11 Xinerama extension library
ii  libxrandr2             2:1.3.0-2         X11 RandR extension library
ii  libxrender1            1:0.9.4-2         X Rendering Extension client libra
ii  shared-mime-info       0.60-2            FreeDesktop.org shared MIME databa
ii  zlib1g                 1:1.2.3.3.dfsg-15 compression library - runtime

Versions of packages libgtk2.0-0 recommends:
ii  hicolor-icon-theme            0.10-2     default fallback theme for FreeDes
ii  libgtk2.0-bin                 2.18.3-1   The programs for the GTK+ graphica

Versions of packages libgtk2.0-0 suggests:
ii  gvfs                          1.4.1-2    userspace virtual filesystem - ser
ii  librsvg2-common               2.26.0-1   SAX-based renderer library for SVG

-- no debconf information