Fix find/replace overlay asyncExecIfOpen running on disposed container#3999

HeikoKlare wants to merge 1 commit into

eclipse-platform:mastereclipse-platform/eclipse.platform.ui:masterfrom

HeikoKlare:fix/asyncExecIfOpen-disposed-container-checkHeikoKlare/eclipse.platform.ui:fix/asyncExecIfOpen-disposed-container-checkCopy head branch name to clipboard