Fix change highlight placement in TextMergeViewer after zoom change#2595

HeikoKlare wants to merge 1 commit intoeclipse-platform:mastereclipse-platform/eclipse.platform:masterfrom

HeikoKlare:textmergeviewer-zoomchange-lineheightsHeikoKlare/eclipse.platform:textmergeviewer-zoomchange-lineheightsCopy head branch name to clipboard