Fix MyLine priority system implementation in comparison methods

[Copilot]

The MyLine class had a priority_level attribute but the comparison methods (__lt__ and __eq__) were only considering line length, completely ignoring the priority system. This caused sorting operations to work incorrectly when lines had different priority levels.

Problem

from CADAlgo.parser import MyLine

# These lines have different priorities but same length
line1 = MyLine((0, 0), (1, 0), priority_level=1)  # Highest priority
line3 = MyLine((0, 0), (1, 0), priority_level=3)  # Lowest priority

# Before fix: comparison only looked at length
print(line1 < line3)  # False (same length, so not less than)
print(line1 == line3)  # True (same length, considered equal)

# This broke priority-based sorting
lines = [line3, line1]
lines.sort()
# Result: [line3, line1] - wrong order!

Solution

Updated __lt__ and __eq__ methods to:

1. Compare by priority first (lower number = higher priority)
2. Use length as tiebreaker when priorities are equal
3. Maintain backward compatibility for existing code using default priority

def __lt__(self, other: "MyLine") -> bool:
    # Compare by priority first (lower number = higher priority)
    if self.priority_level != other.priority_level:
        return self.priority_level < other.priority_level
    # If priorities are equal, compare by length (shorter is better)
    return self.geometry.length < other.geometry.length

After Fix

# Now priority is correctly considered
print(line1 < line3)  # True (priority 1 < priority 3)
print(line1 == line3)  # False (different priorities)

lines = [line3, line1]
lines.sort()
# Result: [line1, line3] - correct priority order!

The fix ensures that:

• Lines with higher priority (lower priority_level numbers) are processed first
• Within the same priority level, shorter lines are preferred
• All existing code continues to work without changes (backward compatible)
• Both sort() and heapq operations now respect the priority system

Created from VS Code via the GitHub Pull Request extension.

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