Description of problem:
When you move the mouse pointer over a calendar event, the tooltip with the event text disappear almost immediately, making impossible to read the text.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Create a calendar event with some text
2. Move the mouse pointer over the event
Impossible to read the tooltip
A readable tooltip
I'm using a gnome-shell wayland session.
Updating to F28 (evolution-3.28.1-2.fc28.x86_64) has resolved this issue.
Thanks for a bug report. I'm not aware of anything in particular what would change that behaviour directly in Evolution code, maybe some lower library, like gtk+, caused some change in the behaviour, but it's only a guess.
I can reproduce this with evolution 3.26.6-1 and gtk3-3.22.26-2 in Fedora 27 and looking on evolution's terminal (when run from it), I see a runtime warning from gtk3 just in time when it should show the tooltip:
> (evolution:23278): Gdk-WARNING **: Window 0x7f27a00031a0 is already mapped at
> the time of grabbing. gdk_seat_grab() should be used to simultanously grab
> input and show this popup. You may find oddities ahead.
A similar warning is shown in Fedora 28 with evolution-3.28.1-2 and gtk3-3.22.29-2, but the tooltip is shown. I believe some change in gtk3 corrected it.