Fix UV editor not showing polygon correctly #73

Job	Run time
📊 Static checks / Code style, file formatting, and docs	2m 30s
🤖 Android / Template (target=template_release)	27m 9s
🍏 iOS / Template (target=template_release)	16m 3s
🍎 macOS / Editor (target=editor, tests=yes)	42m 6s
🍎 macOS / Template (target=template_release)	26m 56s
🐧 Linux / Editor w/ Mono (target=editor)	34m 42s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	37m 14s
🌐 Web / Template (target=template_release)	20m 2s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	30m 32s
🏁 Windows / Editor (target=editor, tests=yes)	41m 24s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	25m 31s
🏁 Windows / Template (target=template_release)	28m 4s
🐧 Linux / Template w/ Mono (target=template_release)	22m 8s
🐧 Linux / Minimal template (target=template_release, everything disabled)	13m 57s
🪲 Godot CPP / Build and test Godot CPP	6m 47s
	6h 15m 5s

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