Add openProposalPopup(boolean beep) to allow suppressing beep when no proposals exist#3394

Copilot wants to merge 2 commits intomastereclipse-platform/eclipse.platform.ui:masterfrom

copilot/add-beep-suppression-optioneclipse-platform/eclipse.platform.ui:copilot/add-beep-suppression-optionCopy head branch name to clipboard