Description of problem:
When a libreoffice window doesn't have focus, the first mouse click (button down) is located incorrectly

Version-Release number of selected component (if applicable):
libreoffice-5.2.3.3-7.fc25.x86_64
gtk3-3.22.2-2.fc25.x86_64
mutter-3.22.1-8.fc25.x86_64
gnome-shell-3.22.1-2.fc25.x86_64

How reproducible:
Always when running in a GNOME (wayland) session.
Never when running in a GNOME (X11) session or with GDK_BACKEND=x11 specified to environment.



Steps to Reproduce:
1. open Calc, side by side with another window
2. un-focus window by clicking into the other window
3. click into any cell in Calc window

Actual results:
Calc selects multiple cells

Expected results:
Calc should not select multiple cells when I didn't move the mouse.



Steps to Reproduce:
1. open Calc, side by side with another window
2. un-focus window by clicking into the other window
3. click into any toolbar button in Calc window

Actual results:
The mouse click isn't handled on the button I clicked. Sometimes it looks like it isn't handled at all (especially if the toolbar is at window bottom). Sometimes it is handled as if I was clicking inside the text pane or a different button/toolbar.

Expected results:
Calc should handle mouse events correctly.



Steps to Reproduce:
1. open Writer, side by side with another window
2. fill in some random text with multiple lines or open a document
3. un-focus window by clicking into the other window
4. click into the text

Actual results:
Writer selects some lines of text

Expected results:
Writer should not select text when I didn't move the mouse.



Additional info:
I guess the cause for this bug is that mouse button down events are using a different coordinate system on focus activation.
It seems like mouse button up events are not affected, neither are any following button down events while the window has focus.