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Much of this stack, from 25 std::__basic_future::wait to 8 operator() is C++ standard library implementation details for running a a task potentially in multiple threads with std::async.
Key thing to find out is whether Geany has enabled multithreaded layout by calling SCI_SETLAYOUTTHREADS. The same code will run single threaded but uses the deferred policy which is equivalent to just calling the task.
A potential clue is the apparent size of the vector being processed by LayoutSegments: 1499999 so 1.5 million segments (lexemes like number or identifier) in a wide line of text although the piece of that text being measured by MeasureWidthsUTF8 is just "728333".
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