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Prevent gaps when rendering fractionally sized elements, resolves #438 #1685

Job	Run time
Emscripten	7m 18s
Linux (clang, clang++, -DRMLUI_BACKEND=GLFW_GL2 -DRMLUI_PRECOMPILED_HEADERS=OFF)	2m 36s
Linux (clang, clang++, -DRMLUI_BACKEND=SDL_VK -DCMAKE_BUILD_TYPE=Debug -DBUILD_TESTING=ON)	3m 17s
Linux (-DRMLUI_BACKEND=GLFW_GL3 -DBUILD_TESTING=ON, true)	3m 56s
Linux-legacy (clang, clang++, -DRMLUI_BACKEND=GLFW_GL2 -DCMAKE_BUILD_TYPE=Debug)	1m 17s
Linux (-DRMLUI_BACKEND=X11_GL2 -DRMLUI_LOTTIE_PLUGIN=ON)	1m 25s
Linux-legacy (clang, clang++, -DRMLUI_BACKEND=SDL_VK -DBUILD_TESTING=ON -DRMLUI_PRECOMPILED_HEADE...	2m 28s
macOS (-DRMLUI_BACKEND=auto)	1m 31s
Linux (-DRMLUI_BACKEND=SDL_GL2 -DRMLUI_CUSTOM_RTTI=ON -DCMAKE_CXX_FLAGS="-fno-exceptions -fno-rtti")	1m 28s
Linux-legacy (-DBUILD_TESTING=ON)	1m 47s
macOS (-DRMLUI_BACKEND=GLFW_GL2)	1m 33s
Linux (-DRMLUI_BACKEND=SFML_GL2 -DRMLUI_THIRDPARTY_CONTAINERS=OFF)	1m 27s
Linux-legacy (-DRMLUI_BACKEND=native -DCMAKE_BUILD_TYPE=Debug -DRMLUI_VK_DEBUG=ON)	1m 42s
Linux (-DRMLUI_BACKEND=GLFW_VK -DCMAKE_BUILD_TYPE=Debug -DRMLUI_VK_DEBUG=ON -DRMLUI_PRECOMPILED_H...	2m 31s
MinGW64	4m 58s
Windows (-DRMLUI_BACKEND=auto -DRMLUI_PRECOMPILED_HEADERS=OFF)	5m 35s
Windows (-DRMLUI_BACKEND=Win32_VK -DRMLUI_VK_DEBUG=ON)	4m 48s
Windows (-DRMLUI_BACKEND=SDL_VK -DRMLUI_LUA_BINDINGS_LIBRARY=luajit)	4m 32s
	54m 9s

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