* Martin Gräßlin <mgraesslin _at_ kde _dot_ org> [2014-10-27 08:59:17 +0100]: > > While developing a Qt application, I noticed some bugs regarding to > > window title handling [1][2][3]. > > I assume that's Qt 5, right? Indeed, it works fine with Qt 4. > > It seems the Qt toolkit only sets _NET_WM_NAME and doesn't set WM_NAME > > at all. Now that raises some questions: > > > > - Should a client also set WM_NAME when setting _NET_WM_NAME? Sure, > > it's a good idea for backwards-compatiblity, but is it warranted to > > open a bug against Qt? (I'd say yes, but I'd like to hear other > > opinions). > > From my reading of the relevant section in ICCCM (4.1.2.1) there is no > indication that a client is supposed to set it. Given that it's certainly not > a bug on Qt's side. If a window manager has problems with it, it's more > because the window manager doesn't support EWMH. Okay. I'll still open a bug in Qt then since it seems to raise problems in the wild - then it's up to them to decide whether it's worth to fix it or not ;) > Qt 5's XCB backend doesn't support many "deprecated" features where there is a > EWMH replacement. For example it also doesn't support setting a window icon > through the WM_HINTS (ICCCM section 4.1.2.4) property. Given that I > interpreted this as a design decision to not support the "deprecated" hints in > the new implementation. Do you mean the backend as in a part of Qt, or xcb itself? > At the same time knowing the Qt development I am sure they would accept > patches if it improves the interoperability. I unfortunately don't feel comfortable enough with C++ to work on Qt (I'm using PyQt). > > - Should a window manager which implements EWMH act correctly when a > > client sets _NET_WM_NAME but not WM_NAME? (see [2]) > > I do not really understand this question. I looked at the bug report and would > say that's a hebstluftwm bug. For comparison KWin handles the situation with > Qt 5 windows correctly. Okay. The question basically "is it the WM's fault, or Qt's fault" ;) > Shameless plug: as you are using Qt 5, consider using KF5::WindowSystem which > is a nice Qt 5 (only, no further KDE dependencies) library implementing EWMH, > supporting fallback to ICCCM if needed. It's the library powering KWin and > Plasma (e.g. taskmanager) and also used in LXQt. Probably not an option with PyQt, and also that's not really a dependency I want to have just to set a window title :D Thanks, Florian -- http://www.the-compiler.org | me _at_ the _minus_ compiler _dot_ org (Mail/XMPP) GPG 0xFD55A072 | http://the-compiler.org/pubkey.asc I love long mails! | http://email.is-not-s.ms/
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