301683 - Killing one application of Mozilla in the Task Manager, also kills all other instances

Status: VERIFIED WONTFIX

(Core :: Widget: Win32, defect)

Description

[Martijn Wargers (dead)]

To reproduce:

- Open multiple instances of the Mozilla application
- Open Task Manager (Ctrl-Alt-Delete)
- Close one instance of Mozilla you see

Result:
After a small delay, all instances of Mozilla get closed.
I would expect that only the one I got selected was closed.

Comment 1

[Stephen Donner [:stephend] Not actively reading bugmail]

If you're talking about the same binary, we don't have multiple instances (like
IE does), they're all the same process space...

Comment 2

[Jo Hermans]

Reporter, there is only 1 instance of Mozilla in the Task Manager, whuihc is
used for all windows together.

Comment 3

[Mark Tyndall]

(In reply to comment #0)
> Result:
> After a small delay, all instances of Mozilla get closed.
> I would expect that only the one I got selected was closed.

The same behaviour can be seen with other multiple-windowed apps (eg MS Word).

Comment 4

[Jo Hermans]

window != process
Some apps, especially primitive like Notepad, open a separate process per
document, because they can only deal w2ith 1 document (so, window) at the same
time. Other apps can open multiple documents in multiple windows, for example
most word processors. Other apps will try to assign each document to each own
process on purpose, but that's normally to add the possibility that a single
document can crash your app, without affecting the others. Or to hide that
they've made errors and in the design, and they really can't handle 2 documents
at once. The disadvantage is that it consumes much more memory, and the 2 apps
needs to cooperate very closely together (the user will not even notice).

Both Word and Internet Explorer are in that last category (separate process per
window), but none of the other browsers do this (they're in the second). See bug
117222 for a discussion about on the side effects.

Comment 5

[Martijn Wargers (dead)]

Ok, thanks for the explanation.