[BUG] Safari data loss from unexpected delete text behaviour about tiddlywiki5

[Jermolene]

Hi @makiaea thank you for the report. This is a frustrating problem.

As I said over on your thread at Talk, the really strange thing is that the problem only occurs for me with https://tiddlywiki.com/ and not https://tiddlywiki.com/empty.html

It would be very helpful to try to narrow down what components of tiddlywiki.com cause the problem. It should be possible to experiment with an empty wiki, gradually adding the content from tiddlywiki.com until the problem occurs.

[makiaea]

hi @Jermolene does the problem not occur with empty.html after the new tiddler has been saved once?

if the tiddler has not been saved once it does not appear to occur for me either

i.e. newly created tiddlers do not initially show this problem

e.g. if we edit the existing GettingStarted tiddler it shows the problem, because it has already been saved once; whereas a new tiddler with new or pasted content does not show the problem, until it is redited

also, newly added text in a previously saved tiddler does not show the problem, only text that has been through the saved process

selecting the "preceding" newline seems at the moment to be essential to cause the bug, my current hypothesis is something happens during save that converts that newline or something adjacent into something that will trigger the bug on selection/deletion after the save

[makiaea]

hi @Jermolene i've done a bit more testing and this bug occurs reliably with the GettingStarted tiddler content, if in its original tiddler or when copied (and saved) into a new tiddler

in some good news, this error does not appear to occur in safari technology preview
Release 186 (Safari 17.4, WebKit 19618.1.10.1.1) announced 20240110

current Sonoma 14.2.1 safari is Version 17.2.1 (19617.1.17.11.12)

[makiaea]

i tried updating to developer betas, but unfortunately
lastest sonoma 14.3 developer beta, with
Safari Version 17.3 (19617.2.4.11.8) still shows the error

latest ios 17.3 developer beta also shows the error

here's hoping (march?) ios/ipados 17.4 will bring safari 17.4 (same as in safari technology preview release 186, with webkit 19618, which seems to work) and it will fix this!

i had a quick search to see if i could identify the relevant change:
186 release notes: https://webkit.org/blog/14916/release-notes-for-safari-technology-preview-186/

includes webkit changes: WebKit/WebKit@7b65ded...dcca261

poss unrelated but could have fixed it: https://commits.webkit.org/272233@main

[makiaea]

seems like a webkit issue that could possibly be fixed by march 2024 in safari 17.4 using webkit 19618

[Jermolene]

Thanks @makiaea – I keep my iPad on the developer beta, so I'll try 17.4 when it's available.