Crash on '{{ }}' in template

[poelzi]

We use grantlee to generate user configureable filenames where the user sets the pattern in a qtextedit.
While testing we noticed that the pattern '{{ }}' crashes the engine, while '{{}}' does not. It must contain at least one space for the crash to occure.

--Type <RET> for more, q to quit, c to continue without paging--

Thread 1 ".mixxx-wrapped" received signal SIGSEGV, Segmentation fault.
0x00007ffff7ec9c16 in Grantlee::Parser::takeNextToken() () from /nix/store/360v6zacms0cdxyq0wxjkjjrsli20q4m-grantlee-5.2.0/lib/libGrantlee_Templates.so.5
(gdb) bt
#0  0x00007ffff7ec9c16 in Grantlee::Parser::takeNextToken() () from /nix/store/360v6zacms0cdxyq0wxjkjjrsli20q4m-grantlee-5.2.0/lib/libGrantlee_Templates.so.5
#1  0x00007ffff7eca442 in Grantlee::ParserPrivate::parse(QObject*, QStringList const&) () from /nix/store/360v6zacms0cdxyq0wxjkjjrsli20q4m-grantlee-5.2.0/lib/libGrantlee_Templates.so.5
#2  0x00007ffff7ecab82 in Grantlee::Parser::parse(Grantlee::TemplateImpl*, QStringList const&) () from /nix/store/360v6zacms0cdxyq0wxjkjjrsli20q4m-grantlee-5.2.0/lib/libGrantlee_Templates.so.5
#3  0x00007ffff7ed2fc1 in Grantlee::TemplatePrivate::compileString(QString const&) () from /nix/store/360v6zacms0cdxyq0wxjkjjrsli20q4m-grantlee-5.2.0/lib/libGrantlee_Templates.so.5
#4  0x00007ffff7ed31c7 in Grantlee::TemplateImpl::setContent(QString const&) () from /nix/store/360v6zacms0cdxyq0wxjkjjrsli20q4m-grantlee-5.2.0/lib/libGrantlee_Templates.so.5
#5  0x00007ffff7eb6693 in Grantlee::Engine::newTemplate(QString const&, QString const&) const () from /nix/store/360v6zacms0cdxyq0wxjkjjrsli20q4m-grantlee-5.2.0/lib/libGrantlee_Templates.so.5
#6  0x0000000000b5c8b9 in TrackExportWorker::updateTemplate (this=0x7ffe934eb880) at /home/poelzi/Projects/mixxx-export/src/library/export/trackexportworker.cpp:139
#7  0x0000000000b58103 in TrackExportDlg::updatePreview (this=0x7ffe934e41d0) at /home/poelzi/Projects/mixxx-export/src/library/export/trackexportdlg.cpp:222
#8  0x00007ffff55b8f7e in ?? () from /nix/store/nwgzcffcjscw62lrfbijkcjbbay6647i-qtbase-5.15.2/lib/libQt5Core.so.5
#9  0x00007ffff6fee092 in QLineEdit::textChanged(QString const&) () from /nix/store/nwgzcffcjscw62lrfbijkcjbbay6647i-qtbase-5.15.2/lib/libQt5Widgets.so.5
#10 0x00007ffff6ff485b in ?? () from /nix/store/nwgzcffcjscw62lrfbijkcjbbay6647i-qtbase-5.15.2/lib/libQt5Widgets.so.5
#11 0x00007ffff55b8fb0 in ?? () from /nix/store/nwgzcffcjscw62lrfbijkcjbbay6647i-qtbase-5.15.2/lib/libQt5Core.so.5

[poelzi]

I now understand that this is only triggered when smartTrimEnabled is true.