fix: thread heading alignment and participants

[hamza221]

fix #11355
fix #11353

b	plain/text	html

[ChristophWurst]

Edge case: emails to yourself now show some "void" underneath the thread heading:

I'm undecided if we should add special handling or make the header height responsive and smaller in that case

[ChristophWurst]

I think the message header (sender + email) should be our reference. Thread header has to move left a few px. Plain text emails as well. The white box of HTML emails should start at the same virtual line.

[hamza221]

Edge case: emails to yourself now show some "void" underneath the thread heading:

I'm undecided if we should add special handling or make the header height responsive and smaller in that case

I faced the same edge case, @nimishavijay what do you think ?

[hamza221]

I'll merge #11354 here because we also want the buttons to align

[ChristophWurst]

Please resolve the conflicts

[ChristophWurst]

/backport to stable5.2

[GretaD]

@hamza221 should i take over this? I have the time. I can also take over the other ones you have started as part of the desgn review we had :)

[hamza221]

@hamza221 should i take over this? I have the time. I can also take over the other ones you have started as part of the desgn review we had :)

Sure yes, thank you.

[ChristophWurst]

/backport to stable5.3

[ChristophWurst]

/backport to stable5.4