Fix 2D debug navigation flickering with tile maps #96607
Merged
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Both the tile map layers and the debug navigation canvas items did fight for the same z order causing a lot of flickering in certain situations.
Before the debug rendering was changed to server use in #92372 this was kinda hidden due to node order. This change now sets the z index one less the navigation agent debug paths index so the paths can render on top of the navigation mesh debug.