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Deleting measurements is not reliable (at least visually), can leave "N/A" values displayed in the table

This may be unpleasantly state-dependent -- i.e., in a same-looking situation, the outcome may differ.

Scenario A

  1. Open a project with a single photo with the regions "head", "thorax", "abdomen", and with existing measurements of specimen:Area, body:Area, head:Area, thorax:Area, abdomen:Area (or compute those measurements now). Was tested when the units were pixels^2.
  2. On the Measurements tab, click the cell with the head area value.
  3. "Delete selected". The cell and the whole head:Area column disappear, as expected.
  4. On the Measurements tab, click the cell with the specimen area value.
  5. "Delete selected". Unexpectedly, the cell (and the whole specimen:Area column) doesn't disappear, but its content changes to N/A.

Steps 2, 3 can be skipped (they are just showing how it's supposed to work).

Scenario B

  1. Open a project with a single photo with the regions "head", "thorax", "abdomen", and with existing measurements of specimen:Area, body:Area, head:Area, thorax:Area, abdomen:Area (or compute those measurements now). Was tested when the units were pixels^2.
  2. On the Measurements tab, click the name of the photo (selecting the whole row).
  3. "Delete selected". Unexpectedly, only the head:Area and thorax:Area columns disappear. Columns/cells specimen:Area, body:Area, and abdomen:Area remain as N/A.

When the photo is deleted completely, freshly imported and the head/thorax/abdomen regions are drawn again, and only the values of head:Area and thorax:Area are computed, selecting the row and clicking "Delete selected" now empties the row as expected, leaving no columns except the photo name.

Having only abdomen:Area, only specimen:Area, or only body:Area and trying to delete it was also successful.

Having specimen:Area, body:Area, head:Area, thorax:Area, abdomen:Area, and then Ctrl+click selecting specimen:Area, head:Area, abdomen:Area and deleting resulted in specimen:Area disappearing, but head:Area and abdomen:Area turning into N/A.

After closing and re-opening a project with those N/A values, the cells that originally displayed N/A were gone.