[bug] Glitchy MPE table floating tile

[d.healey]

Adding a new mod, deleting and existing one, or just scrolling in the viewport clears out the display of the combo boxes.

HiseSnippet 1107.3oc6X80aiSDDe2jrERJTtCcBg3I+.f5INUkjlV.gDWZSSph3RSTctBucZq8l3U0dWi85bDgPhOZ7Qfm3yw8MnrqsSr8Uq1Tq.8tp5Gr7L6Ldm427GuiG4wMH99bO.r534tD.7iP5yYBqNVXJCz+H.bKz.ruf3oEw5v4tXeehI.BKerhArZEP30ad9gXaLyfjvB.NiSMHuf5PEIbG09mn118vljwTmTR2pceCNqC2lGHsmxn5.WrwE3ojSvJwJg.vM5ZREbOcAVP7kxbH2bttE+0rH4Oi5SO2lnHZ.zkunH1fNVTayQK7Ue..hFk34ki77mfFPMoK4mf.OJbAsDMRiAvRWmI03VXRvTlTkHS5wHcCOpqHYEk8rIpOSFPlfkPcZSIRV.7uPc3RAXhcbvWP54IIVpv16Wu9yzj2d5OLIfYHnblFmcBWPFx19o098ZUq8G0zd6klLI20TaiG21l3k6xpnq20o31r.myIdOSaF1NfrTPo6mES2X0vTiHuNkfbVeFULzkDS2iaapvJ0yWMB.hgM4Sur+QXAVETh4Ikyk3InJyAdDYlLqNJDUEcDw+BA2MTVGWNS8Ff0Dw4TQAkd1brfxlNlJMapzB9DTZVM.+V5hl4ID+X6XCHZ2pgFLp6HLiXCNe5hJkparPQpf3jv8xKu7OyxsYL6uPw90TSgkrR.90k..KBcpkPQ8OPUI5UREkEAby.arHakgpEP7BxPalzQUNGymJlmtEwsnbo90Vtrpl3iQinBCq7swR4Xixf9+E1XbSlOF0cxDhgHw.qf58KEsixpu8aEs8ahzoLRXG9vM+yBo09Y7Lh1wDFwSAdMtll7+8p1j2ckaxOzPH29wdXluK2OyKVm3PGKqn7Sy7k9xdZje8TUzLM+NbrWtK8lm2S5j4piNVD3ElVbfCOfIxjFTNabnxp0EJaEQJ4yokek6fuBsdJqtCq7gevnqbpkGIyicbsIcYyH1xN0g13mJaMOAGXKVvMah8.Ni6ZwYTizQ8SIBO5zoDuz1dtNzABg73IIbdR6SI1Db5L3ur8KjYdXOINQJHVb6OzPtwqOGEYtZppQs67N1aFYpao9b1RqcQZ9ntZK4sdCYGS7k06jNcRyT2gyEVgeINciJZ63rmyTGNISSiPEHl4tEiwgfwWgZ1ZmrWyFJuM4aTO98c1YG1rgf0VdPgv1lumhspAAtSAtce.3JFv05AfqX.2dO.bEC31+Afa8LpT462iJcJOPML9.rLUPNKN5j.Gc4DJFD4tyjia6qFMtjZJiH55J5nQTXlgDxwpuLdwFJZX7hMVr3+K6gC1vi+Jin+uh5.heXHGoeyB+IZUQCTzZM.yd6zRG43EuxvH6q5JJ1rnJtaQUrUQUbuhp39EUwusnJ9c2rhpo+NHPvchJMA.YetveRED1koZZD9CMfajd3n04ApeW6ryfavQa8tuiJaxeSdQy6Edwt2K7h8tW3E6+9gW7u.tV5M.