[Bug] Thumbnails do not appear normally in v1.7.2

[czyrichard]

Describe the bug

Thumbnails do not appear normally in v1.7.2

To Reproduce

1. Hide the thumbnail pane
2. Create five pages, and put content on each page
3. Activate the thumbnail pane

Expected behavior

All the thumbnails should be displayed normally.

Actual behavior

All the thumbnails are just blanks. I have to activate each page to get the thumbnail displayed normally.

Context

• reproducibility : systematic
• OpenBoard version :
  • bug happens with : 1.7.2
• OS :
  • bug happens with : Windows
  • didn't check : Linux macOS
• Installation source : OpenBoard download page
• number and resolution of monitors : 2
• OS(es) detailed version (for the ones you reproduced the bug on)
  • Windows : 10

[letsfindaway]

Confirmed. Thanks for reporting. This is actually a regression in 1.7.2.

[letsfindaway]

Note that this bug also appears when you load an existing document, make modifications to the pages while the thumbnail palette is hidden, and then open the thumbnail palette. Thumbnails for modified pages have not been updated except for the current page.