v7.4.0

Changed

• Improved the Label dialog so blank labels cannot be submitted and shared fields can be edited across Shapes with different Labels when validate_label is exact (#2587)
• Reworded the LineStrip tooltip to "Click to place linestrip points; Ctrl+click places the last one"; label, shortcut, icon, and behavior are unchanged (#2595)
• Polygon, linestrip, and AI-Points clicks share one canvas handler; Ctrl+Shift+click now also places the last linestrip point, matching AI-Points (#2596)

Fixed

• Prevent a crash when resizing the window after closing an image in Fit to Window or Fit to Width mode. (#2603)
• Fixed Keep Previous Scale restoring stale per-Image viewports during navigation. (#2604)