See https://bugs.launchpad.net/pinta/+bug/1949644

• Allow cycling tabs in most recently used order with Ctrl+Tab and Ctrl+Shift+Tab
• Allow going to left|right tab in listed order with Ctrl+PgUp and Ctrl+PgDown
• Allow reopening last closed tab with Ctrl+Shift+T (maybe list them in the down arrow button after the tabs, in a separate section "Reopen")
• Add "New Tab" (plus) button next to last tab - it's like "New..." but uses same dimensions as current document without asking:
  Can also trigger it with Ctrl+T or middle-click on empty tab space