Created attachment 116364 [details]
Spreadsheet showing the bug

To reproduce the bug, open the attached file Trends.ods:
1. Go to the first page (unlabelled, but it is the page that displays all the charts).
2. Double-click the first chart (January, under Temperature trends).
3. Right-click on the chart and select "data ranges".
4. Select Data Series tab.
5. Under 'data ranges' select y-Values.
6. Change the Range for y-Values from $Temperature.$B$3:$B$14 to $Temperature.$B$3:$B$15 (that is, add an extra cell to the range).
7. Click OK. At this point, the modified chart is correctly displayed.
8. Click anywhere outside the chart to deselect the chart. The chart reverts to what it was before editing.

Notes:
1. The edits have been saved, as double-clicking on the chart again shows the data series values have actually been changed; it is just the display of the chart that is not updated after editing.
2. This bug did not exist in version 4.1.3.1 (which is the latest version I used before updating to 4.3.7.2).