fix: harden existing-tab matching and document issue workflow#1108

chhoumann merged 2 commits intomasterchhoumann/quickadd:masterfrom

780-bug-quickadd-opens-newly-created-file-in-two-separate-tabs-when-using-cmd+n-on-macoschhoumann/quickadd:780-bug-quickadd-opens-newly-created-file-in-two-separate-tabs-when-using-cmd+n-on-macosCopy head branch name to clipboard