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Fix r_showtris #171

Job	Run time
macOS x86_64 Debug (Non-Portable)	3m 18s
Windows x86 Debug (Non-Portable)	3m 15s
macOS x86_64 Release (Non-Portable)	3m 23s
Windows x86 Release (Portable)	8m 44s
Ubuntu x86 Debug (Non-Portable)	3m 18s
WinXP x86 Release (Non-Portable)	13m 12s
Windows x86 Release (Non-Portable)	4m 9s
WinXP x86_64 Release (Non-Portable)	14m 20s
Ubuntu x86 Release (Non-Portable)	4m 18s
Windows x86_64 Debug (Non-Portable)	5m 52s
Ubuntu x86_64 Debug (Non-Portable)	2m 36s
Windows x86_64 Release (Portable)	4m 26s
Ubuntu x86_64 Release (Non-Portable)	3m 33s
Windows x86_64 Release (Non-Portable)	7m 35s
create-latest	0s
create-release	0s
	1h 21m 59s

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