Please just send the coordinates of the grey quad with the white outline...
; Draw filled quad
Send command 0x8020H ; set X[0] to 32
Send command 0x0C032H ; set Y[0] to 50
Send command 0x9040H ; set X[1] to 64
Send command 0x0D028H ; set Y[1] to 40
Send command 0x0A01CH ; set X[2] to 28
Send command 0x0E041H ; set Y[2] to 65
Send command 0x0B03AH ; set X[3] to 58
Send command 0x0F03CH ; set Y[3] to 60
Send command 0x0BFFH ; draw filled quadrilateral
Send command 0x0DFFH ; draw filled quadrilateral
; Draw outline quad
Send command 0x8020H ; set X[0] to 32
Send command 0x0C032H ; set Y[0] to 50
Send command 0x9040H ; set X[1] to 64
Send command 0x0D028H ; set Y[1] to 40
Send command 0x0A01CH ; set X[2] to 28
Send command 0x0E037H ; set Y[2] to 55
Send command 0x0B03AH ; set X[3] to 58
Send command 0x0F03CH ; set Y[3] to 60
Send command 0x05FFH ; draw quadrilateral
Is this what you're after?
Well, almost, the 2 y[2] coordinates are different. Of course the outline wont sit ontop the quad.
I'm assuming you miss understood my instructions.
Which y[2] number, both drawn with the same coordinates generates the bug?
To tell, just do this:
; Draw filled quad and outline with a different color
Send command 0x8020H ; set X[0] to 32
Send command 0x0C032H ; set Y[0] to 50
Send command 0x9040H ; set X[1] to 64
Send command 0x0D028H ; set Y[1] to 40
Send command 0x0A01CH ; set X[2] to 28
Send command 0x0E041H ; set Y[2] to 65
Send command 0x0B03AH ; set X[3] to 58
Send command 0x0F03CH ; set Y[3] to 60
Send command 0x0BFFH ; draw filled quadrilateral
Send command 0x0DFFH ; draw filled quadrilateral
Send command 0x05FFH ; draw quadrilateral
Visually inspect, the clear the screen and do this:
; Draw filled quad and outline with a different color
Send command 0x8020H ; set X[0] to 32
Send command 0x0C032H ; set Y[0] to 50
Send command 0x9040H ; set X[1] to 64
Send command 0x0D028H ; set Y[1] to 40
Send command 0x0A01CH ; set X[2] to 28
Send command 0x0E037H ; set Y[2] to 55
Send command 0x0B03AH ; set X[3] to 58
Send command 0x0F03CH ; set Y[3] to 60
Send command 0x0BFFH ; draw filled quadrilateral
Send command 0x0DFFH ; draw filled quadrilateral
Send command 0x05FFH ; draw quadrilateral
Wait, without different colors on the outline, how do you know if the bug appears?