Bug#976274: libqt5gui5: Please build Qt5 with configure option -xcb-native-painting

[Andre Woebbeking <Woebbeking@web.de>]

Package: libqt5gui5
Version: 5.15.1+dfsg-4
Severity: wishlist
X-Debbugs-Cc: Woebbeking@web.de

Dear Maintainer,

with X2Go Qt5 apps are much slower than X or GTK apps. But there is a workaround:
setting the environment variable QT_XCB_NATIVE_PAINTING.

This worked until testing updated to Qt 5.15 because upstream disabled the automatic
configuration of this feature in commit 7f948d9effad983477977c3274231401f260c531.

So please build Qt5 with -xcb-native-painting to make X2Go users happy again :-)

Cheers,
André

-- System Information:
Debian Release: testing
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.9.0-2-amd64 (SMP w/8 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libqt5gui5 depends on:
ii  fontconfig                        2.13.1-4.2
ii  libc6                             2.31-4
ii  libdrm2                           2.4.103-1
ii  libegl1                           1.3.2-1
ii  libfontconfig1                    2.13.1-4.2
ii  libfreetype6                      2.10.2+dfsg-4
ii  libgbm1                           20.2.3-1
ii  libgcc-s1                         10.2.0-19
ii  libgl1                            1.3.2-1
ii  libglib2.0-0                      2.66.3-1
ii  libharfbuzz0b                     2.6.7-1
ii  libice6                           2:1.0.10-1
ii  libinput10                        1.16.4-1
ii  libjpeg62-turbo                   1:2.0.5-1.1
ii  libmd4c0                          0.4.6-1
ii  libmtdev1                         1.1.6-1
ii  libpng16-16                       1.6.37-3
ii  libqt5core5a [qtbase-abi-5-15-1]  5.15.1+dfsg-4
ii  libqt5dbus5                       5.15.1+dfsg-4
ii  libqt5network5                    5.15.1+dfsg-4
ii  libsm6                            2:1.2.3-1
ii  libstdc++6                        10.2.0-19
ii  libudev1                          246.6-4
ii  libx11-6                          2:1.6.12-1
ii  libx11-xcb1                       2:1.6.12-1
ii  libxcb-glx0                       1.14-2
ii  libxcb-icccm4                     0.4.1-1.1
ii  libxcb-image0                     0.4.0-1+b2
ii  libxcb-keysyms1                   0.4.0-1+b2
ii  libxcb-randr0                     1.14-2
ii  libxcb-render-util0               0.3.9-1+b1
ii  libxcb-render0                    1.14-2
ii  libxcb-shape0                     1.14-2
ii  libxcb-shm0                       1.14-2
ii  libxcb-sync1                      1.14-2
ii  libxcb-xfixes0                    1.14-2
ii  libxcb-xinerama0                  1.14-2
ii  libxcb-xinput0                    1.14-2
ii  libxcb-xkb1                       1.14-2
ii  libxcb1                           1.14-2
ii  libxkbcommon-x11-0                1.0.3-2
ii  libxkbcommon0                     1.0.3-2
ii  zlib1g                            1:1.2.11.dfsg-2

Versions of packages libqt5gui5 recommends:
ii  libqt5svg5             5.15.1-2
pn  qt5-gtk-platformtheme  <none>

Versions of packages libqt5gui5 suggests:
ii  qt5-image-formats-plugins  5.15.1-2
pn  qtwayland5                 <none>

-- no debconf information