Bug#711142: gnuplot-qt: zooming with the 'wxt' terminal yields blank contents

[Vincent Lefevre]

Package: gnuplot-qt
Version: 4.6.3-1
Severity: normal

The "zoom" documentation says:

 Zooming is usually accomplished by holding down the left mouse button and 
 dragging the mouse to delineate a zoom region.  Some platforms may require
 using a different mouse button.  The original plot can be restored by typing
 the 'u' hotkey in the plot window.  The hotkeys 'p' and 'n' step back and
 forth through a history of zoom operations.

 The option `zoomcoordinates` determines if the coordinates of the zoom box are
 drawn at the edges while zooming. This is on by default.

 If the option `zoomjump` is on, the mouse pointer will be automatically
 offset a small distance after starting a zoom region with button 3. This can
 be useful to avoid a tiny (or even empty) zoom region. `zoomjump` is off by
 default.

Under Debian, in a 'wxt' terminal (which is the default one), zooming
is actually initiated with the right mouse button. Anyway. Once done,
the zoomed window doesn't contain anything. For instance, run:

$ GNUTERM=wxt gnuplot -persist <<EOF
plot '-' using 1:2 t '' with line
0 0
10 10
e
EOF

One gets a straight line from (0,0) to (10,10). Then delimit a zoom area
from around (2,8) to (8,2), by clicking with the right button over (2,8)
and clicking with any button overs (8,2). The obtained result is blank
instead of containing a part of the line.

-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.9-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages gnuplot-qt depends on:
ii  libc6           2.17-4
ii  libcairo2       1.12.14-4
ii  libedit2        2.11-20080614-5
ii  libgcc1         1:4.8.1-2
ii  libgd2-xpm      2.0.36~rc1~dfsg-6.1
ii  libglib2.0-0    2.36.1-2build1
ii  liblua5.1-0     5.1.5-4
ii  libpango1.0-0   1.32.5-5+b1
ii  libqt4-network  4:4.8.4+dfsg-4
ii  libqt4-svg      4:4.8.4+dfsg-4
ii  libqtcore4      4:4.8.4+dfsg-4
ii  libqtgui4       4:4.8.4+dfsg-4
ii  libstdc++6      4.8.1-2
ii  libwxbase2.8-0  2.8.12.1-12
ii  libwxgtk2.8-0   2.8.12.1-12
ii  libx11-6        2:1.5.0-1+deb7u1

gnuplot-qt recommends no packages.

Versions of packages gnuplot-qt suggests:
ii  gnuplot-doc  4.6.3-1

-- no debconf information