Start Writer, open the sidebar, select the Stylist, and move the mouse over some entries. The console shows: soffice.bin: /home/ht/Sources/libreoffice/vcl/source/app/dbggui.cxx:36: void ImplDbgTestSolarMutex(bool): Assertion `ImplGetSVData()->mpDefInst->GetYieldMutex()->IsCurrentThread() && "SolarMutex not owned!"' failed. Gtk-Message: 16:30:28.633: GtkDialog mapped without a transient parent. This is discouraged. Does not happen for kf6/gen/gtk3. Version: 26.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: 7d2b92d0e78751ac00d25dd312f7bc77abe96b4e CPU threads: 32; OS: Linux 6.16; UI render: default; VCL: gtk4 Locale: en-US (en_US.UTF-8); UI: en-US Calc: threaded
Pending fix: https://gerrit.libreoffice.org/c/core/+/190318
Michael Weghorn committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/b6cded6e887aa8e15496afb68bd3a4add4af7c12 tdf#168041 gtk: Hold SolarMutex when querying tree view tooltip It will be available in 26.2.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.