mouse over in preview area moves the section

[MStraeten]

When zooming in the selection frame is floating around along to mouse movments after an initial dragging in the preview.
It needs pressing a key thats not defined to be used with mouse movements (e.g. Esc key) to leave the preview area without changing the selection frame.

To Reproduce

1. Use current master
2. open image in darkroom and zoom in
3. place mouse pointer in preview area
4. move around without pressing a button
5. the selection frame follows your mouse

Which commit introduced the error
t.b.d

Platform

• darktable version : current master 3.7.0+833~g307903a2a
• OS : Win10, also OSX

[MStraeten]

bisecting done:

ff2f1d566f84278580d8469a53fc1945f3e3b6a5 is the first bad commit
commit ff2f1d566f84278580d8469a53fc1945f3e3b6a5
Author: Diederik ter Rahe <dterrahe@yahoo.com>
Date:   Sat Aug 7 13:39:28 2021 +0100

    shortcut tooltips and visual mapping for navigation and histogram

 src/libs/histogram.c  | 4 ++++
 src/libs/navigation.c | 2 ++
 2 files changed, 6 insertions(+)

--> #9747

[dterrahe]

Wow. "Interesting" side effect of setting GDK_ENTER_NOTIFY_MASK (which is needed to change the mouse cursor when entering the navigation widget in mapping mode to indicate you can assign a shortcut). For me this only happens after I press the mouse in the widget at least once. But then it doesn't stop. I'm investigating...

[dterrahe]

Used gtk_widget_set_events instead of gtk_widget_add_events. #9828 fixes.