The ornamental design for a connectionbracket of buildinginterior material, as shown and described.
FIG. 1 is a top, front and left side perspective view of the connection bracket of building interior material;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a back elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof, with broke lines depicting portions of the connection bracket of building interior material that form no part of the claimed design; and,
FIG. 8 is a top view thereof, with broken lines showing additional assembled connection brackets in a condition of use, depicting environment that forms no part of the claimed design.