Tents and fences render incorrectly in isometric mode

[Chezzo]

From Kedryn in the Forums.

Kedryn found that tents and fences render incorrectly in isometric mode, "because f_canvas_wall and f_canvas_door, not being actual walls and doors, don't line up or rotate properly. The doors won't 'attach' to the walls and the walls won't make corners if a door is next to it instead of a wall."

[Karlieb]

Would this help or work only with terrain tiles? Would 'fix' the water, anyhow.

#14874

[hitbutton]

The fences are a tileset issue. t_fence_v and t_fence_h are functionally identical to t_fence since #14874, so those terrains just need the connections set up in the same way in the tileset config.

The tent issue is a bit thornier, rooted in the fact that tents are implemented as furniture instead of terrain. Connection groups to allow furniture to connect to furniture of a different type aren't implemented in the code right now.