Bug#773451: libqtcore4:amd64: QRectF.setTop() and co do not play nicely with non-numbers (NaN and INF)

[Vincent Fourmond <fourmond@debian.org>]

Package: libqtcore4
Version: 4:4.8.6+git64-g5dc8b2b+dfsg-2+b1
Severity: normal

  Hello,

  I've been hit by a bug where I have essentially this: (ret is QRectF)

    ret.setTop(0.1);
    ret.setBottom(-0.1);
    o << "Fxd: " << ret.height() << " -> " << ret.top() << " | "
      << ret.bottom() << endl;

  The output line shows that, if you have a NaN in the coordinates,
  then the line above DOES NOT set the top and bottom coordinates
  (they stay at NaN):

    Fxd: nan -> nan | nan

  Looking at the code for setTop, it all makes sense, as the pro

inline void QRectF::setTop(qreal pos) { qreal diff = pos - yp; yp +=
diff; h -= diff; }

  However, this is very confusing at best... Looking at the
  documentation, calling moveTop and then setBottom may be smarter,
  but, it really should just work...

  Best regards,

       Vincent

  
  



-- System Information:
Debian Release: 8.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.14-2-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libqtcore4:amd64 depends on:
ii  libc6              2.19-13
ii  libgcc1            1:4.9.2-8
ii  libglib2.0-0       2.42.1-1
ii  libstdc++6         4.9.2-8
ii  multiarch-support  2.19-13
ii  qtcore4-l10n       4:4.8.6+git64-g5dc8b2b+dfsg-2
ii  zlib1g             1:1.2.8.dfsg-2+b1

libqtcore4:amd64 recommends no packages.

Versions of packages libqtcore4:amd64 suggests:
ii  libicu52  52.1-6
ii  libthai0  0.1.21-1

-- no debconf information