Fix: Initialize plane_2d to -1 in ShowMetricsWindow#170
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Initialize local variable plane_2d to -1 in ShowMetricsWindow to address MSVC warning C4701: "potentially uninitialized local variable 'plane_2d' used". This sets a known sentinel value to avoid use-before-initialization and undefined behavior, while preserving existing logic and silencing the compiler warning.
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Initialize local variable plane_2d to -1 in ShowMetricsWindow to address MSVC warning C4701: "potentially uninitialized local variable 'plane_2d' used". This sets a known sentinel value to avoid use-before-initialization and undefined behavior, while preserving existing logic and silencing the compiler warning.