On Sun, Jan 5, 2014 at 6:42 AM, Stephan Witt <st.w...@gmx.net> wrote: > Am 05.01.2014 um 00:18 schrieb Scott Kostyshak <skost...@lyx.org>: > >> On Thu, Jan 2, 2014 at 10:49 AM, Stephan Witt <st.w...@gmx.net> wrote: >> >>> There are no messages. LyX 2.0.7 is affected too on my system. >>> It looks like the problem is a run-time effect and QFontMetrics::maxWidth() >>> is the culprit. The attached patch helps. But I don't know if there is >>> another >>> solution. >> >> Why doesn't a Git bisect help here? Was the problem triggered by an >> update of the Qt libraries? > > Short answer: yes, it's triggered by an update of the Qt libraries. > The result of QFontMetrics::maxWidth() is simply 0 for the given font. > > It's a multi-dimensional problem. There are > * multiple OS-versions (Mac OS 10.4 .. 10.9) > * multiple CPU-archs (i386, ppc, x86_64) > * multiple Qt-versions (4.6.x, 4.8.x, 5.x) > * multiple Qt-variants (Mac API for Carbon and Cocoa) > * multiple tool versions (automake 1.11 .. 1.14 etc.) > * multiple LyX versions (lyx-2.0.x, lyx-2.1.x) > > Not all combinations work, some Qt-version is not compilable on some > OS-version or some CPU-architecture. But the biggest hurdle is the > tool chain evolution over time. For a git bisect you need a fast machine. > The fastest machine I have uses automake 1.14 and so I cannot compile most > of the "history of lyx".
I've had this problem also. git cherry-pick c31bf2d2 Usually fixes it cleanly for me. > In fact I'm able to compile on this machine the latest LyX versions only. > One complete build of LyX on the elder machine I have - the only device to > do a git bisect on - lasts about 10 minutes. > > There are other font problems with Qt I'm unable to solve, e.g. > http://www.lyx.org/trac/ticket/7954 Ah, the infamous omega bug! > BTW, of course Qt has more than one font rendering engine… > > It's an a little bit frustrating experience, indeed. I imagine so, especially since you're one of the few developers focusing on Mac-specific issues. Thanks for the explanation Stephan, Scott
