inmethod-grid: Fix for #44: IE9 miscalculates the table sizes on hover.
This leads to a "dancing" bottom-toolbar. We have to force the browser
to do a full relayout on hover to fix this problem.
Backport to master of #303
Merge pull request #304 from rototor/ie9-inmethod-grid-hover-fix

inmethod-grid: Fix for #44: IE9 miscalculates the table sizes on hover.