Bug 579275

Summary: Can't reattach view in when Windows are overlapping in Multi-Window Application
Product: [Eclipse Project] Platform Reporter: David Url <david>
Component: UIAssignee: Platform-UI-Inbox <Platform-UI-Inbox>
Status: NEW --- QA Contact:
Severity: normal    
Priority: P3 CC: david, wim.jongman
Version: 4.22   
Target Milestone: ---   
Hardware: PC   
OS: Windows 10   
Whiteboard:

Description David Url CLA 2022-03-16 05:38:00 EDT 
I have an e4 application that consists of two TrimmedWindows where each Window shows different perspectives. When i detach a view I can only reattach it to the perspective where it came from. This is fine.

However, when the two windows overlap, I can't even attach it at any position in the original perspective, where it overlaps the other window.

E.g. Each window with size 100x100:
- Window1 position: x=0,y=0
- Window2 position: x=50,y=0
- Detached View from Window 2

reattach fails:
- to Window1
- to Window2 anywhere between positions x=50,y=0 to x=100,y=100 (I would expect that to work)

reattach succeeds:
- to Window2 anywhere between positions x=100,y=0 to x=150,y=100

So from my understanding there seems to be a bug somewhere int he logic for "at which perspective am i pointing at" as it does not take z into account.
Comment 1 David Url CLA 2022-03-16 05:47:22 EDT 
A colleague reminded me that this is only happening to Window2, when it is created before Window1 during application startup. Sorry for the naming.
Comment 2 Wim Jongman CLA 2022-03-16 07:16:34 EDT 
When WB is overlapping WA then WA is not active. It makes sense to me that the view cannot be dropped on an inactive WA.

If I misunderstood then a screenshot or little movie would be nice to get an idea.
Comment 3 David Url CLA 2022-03-16 07:22:50 EDT 
Window1 is inactive, Window2 is active and the view belongs to Window2. But it still can not be dropped on active Window2, when there is inactive Window1 behind it.