Lost underlining and bookmarks in merge between JWL Apps on Windows and Android about jwlmerge

[AntonyCorbett]

@ck-- Thanks for the report. I can't reproduce the issue, but would be happy to investigate further if you can provide the 2 backup files. You can email them to me if you want.

[ck--]

@AntonyCorbett Thanks for answering. Just sent you the files.

[AntonyCorbett]

@ck-- Consider the first screenshot showing no highlighting in para 17 of the publication. I reset the data in JWL and then imported the Windows backup - there was no highlighting for para 17. I then reset the data again and restored the Android backup - again there was no highlighting in para 17. This obviously explains why there is no highlighting in the merged file. It looks like the backup files themselves may not contain the data you think they do. If you can provide a precise set of instructions that clearly shows the issue then I will investigate further, but at the moment it looks like the merge operation is working properly.

[ck--]

@AntonyCorbett this sounds like the JWL App itself does incorrect backups.
I added the underlines on Android at paras 17ff and then started the backup. So on Android they must be in the file. This is very strange...

[AntonyCorbett]

@ck-- it could be that the database on your android device is corrupt. I'll close the issue, but please let me know if you find out more.

[ck--]

@AntonyCorbett How can I find that out whether it is corrupt?
How can that happen? I have iteratively and weekly merged data from 2 and then 3 devices for at least 6 iterations. Could that have caused the corruption?

[ck--]

@AntonyCorbett Could you please also have a look whether in UserDataBackup_2021-03-04_CK-SURPRO.jwlibrary para 16 has correct underlines? Or can you tell me how I can find out myself?

[AntonyCorbett]

@ck-- The JWL database is not particularly resilient to crashes and doesn't have comprehensive integrity constraints, so it is prone to corruption. However, the usual symptom is that JWL won't load or crashes regularly.

[AntonyCorbett]

@ck-- You can tell what is in your backup file by resetting your data on Windows (Uninstall Programs => JWL => Advanced => Reset) and then importing the backup file.

[AntonyCorbett]

@ck-- Further to the above, there's an interesting article on the SQLite website regarding database corruption: https://www.sqlite.org/howtocorrupt.html
In addition to this there is the potential for loss of internal integrity in any database schema where relevant constraint checks are missing. The JWL database schema is updated occasionally to include additional checks.