Fix TileMap Display Grid fadeout

editor/plugins/tiles/tile_map_editor.cpp

@@ -848,9 +848,9 @@ void TileMapEditorTilesPlugin::forward_canvas_draw_over_viewport(Control *p_over
 
 							// Fade out the border of the grid.
 							float left_opacity = CLAMP(Math::inverse_lerp(0.0f, (float)fading, (float)pos_in_rect.x), 0.0f, 1.0f);
-							float right_opacity = CLAMP(Math::inverse_lerp((float)drawn_grid_rect.size.x, (float)(drawn_grid_rect.size.x - fading), (float)pos_in_rect.x), 0.0f, 1.0f);
+							float right_opacity = CLAMP(Math::inverse_lerp((float)drawn_grid_rect.size.x, (float)(drawn_grid_rect.size.x - fading), (float)(pos_in_rect.x + 1)), 0.0f, 1.0f);
 							float top_opacity = CLAMP(Math::inverse_lerp(0.0f, (float)fading, (float)pos_in_rect.y), 0.0f, 1.0f);
-							float bottom_opacity = CLAMP(Math::inverse_lerp((float)drawn_grid_rect.size.y, (float)(drawn_grid_rect.size.y - fading), (float)pos_in_rect.y), 0.0f, 1.0f);
+							float bottom_opacity = CLAMP(Math::inverse_lerp((float)drawn_grid_rect.size.y, (float)(drawn_grid_rect.size.y - fading), (float)(pos_in_rect.y + 1)), 0.0f, 1.0f);
 							float opacity = CLAMP(MIN(left_opacity, MIN(right_opacity, MIN(top_opacity, bottom_opacity))) + 0.1, 0.0f, 1.0f);
 
 							Transform2D tile_xform;
@@ -2996,9 +2996,9 @@ void TileMapEditorTerrainsPlugin::forward_canvas_draw_over_viewport(Control *p_o
 
 							// Fade out the border of the grid.
 							float left_opacity = CLAMP(Math::inverse_lerp(0.0f, (float)fading, (float)pos_in_rect.x), 0.0f, 1.0f);
-							float right_opacity = CLAMP(Math::inverse_lerp((float)drawn_grid_rect.size.x, (float)(drawn_grid_rect.size.x - fading), (float)pos_in_rect.x), 0.0f, 1.0f);
+							float right_opacity = CLAMP(Math::inverse_lerp((float)drawn_grid_rect.size.x, (float)(drawn_grid_rect.size.x - fading), (float)(pos_in_rect.x + 1)), 0.0f, 1.0f);
 							float top_opacity = CLAMP(Math::inverse_lerp(0.0f, (float)fading, (float)pos_in_rect.y), 0.0f, 1.0f);
-							float bottom_opacity = CLAMP(Math::inverse_lerp((float)drawn_grid_rect.size.y, (float)(drawn_grid_rect.size.y - fading), (float)pos_in_rect.y), 0.0f, 1.0f);
+							float bottom_opacity = CLAMP(Math::inverse_lerp((float)drawn_grid_rect.size.y, (float)(drawn_grid_rect.size.y - fading), (float)(pos_in_rect.y + 1)), 0.0f, 1.0f);
 							float opacity = CLAMP(MIN(left_opacity, MIN(right_opacity, MIN(top_opacity, bottom_opacity))) + 0.1, 0.0f, 1.0f);
 
 							Transform2D tile_xform;
@@ -3881,9 +3881,9 @@ void TileMapEditor::forward_canvas_draw_over_viewport(Control *p_overlay) {
 
 				// Fade out the border of the grid.
 				float left_opacity = CLAMP(Math::inverse_lerp(0.0f, (float)fading, (float)pos_in_rect.x), 0.0f, 1.0f);
-				float right_opacity = CLAMP(Math::inverse_lerp((float)displayed_rect.size.x, (float)(displayed_rect.size.x - fading), (float)pos_in_rect.x), 0.0f, 1.0f);
+				float right_opacity = CLAMP(Math::inverse_lerp((float)displayed_rect.size.x, (float)(displayed_rect.size.x - fading), (float)(pos_in_rect.x + 1)), 0.0f, 1.0f);
 				float top_opacity = CLAMP(Math::inverse_lerp(0.0f, (float)fading, (float)pos_in_rect.y), 0.0f, 1.0f);
-				float bottom_opacity = CLAMP(Math::inverse_lerp((float)displayed_rect.size.y, (float)(displayed_rect.size.y - fading), (float)pos_in_rect.y), 0.0f, 1.0f);
+				float bottom_opacity = CLAMP(Math::inverse_lerp((float)displayed_rect.size.y, (float)(displayed_rect.size.y - fading), (float)(pos_in_rect.y + 1)), 0.0f, 1.0f);
 				float opacity = CLAMP(MIN(left_opacity, MIN(right_opacity, MIN(top_opacity, bottom_opacity))) + 0.1, 0.0f, 1.0f);
 
 				Transform2D tile_xform;