E-book viewer: highlights get unexpectedly deleted

[etc205]

1. Open "Quick Start Guide" that comes with calibre in the viewer.
2. Press Ctrl+h to display the highlights pane.
3. Press Ctrl+t to display the table of contents.
4. Click on the "Installing calibre" ToC item.
5. Select the text "The installation processes" at the beginning of the chapter and press Shift+q to create a highlight.
6. Righ-click on the highlight in the pane and select "Modify this highlight". Add some text and click on "Apply".
7. Double click on the highlight in the pane.
8. Righ-click on the highlight in the pane and select "Modify this highlight" again. The viewer emits an error "Error: Highlight text missing" and deletes the highlight in the pane (but not in the book).

Calibre version: 6.25,
OS: Windows 10 Home.

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.