New scanned paged not displayed when window is not visible

tiramiseb commented 8 years ago

I'm experiencing a weird problem...

As long as the Paperwork window is visible (or as long as I am displaying the GNOME virtual desktop where Paperwork is placed), everything works perfectly.

But if I switch to a different workspace/virtual desktop when scanning, the Paperwork window doesn't change (however, the scanned page is correctly stored in the filesystem).

Afterwards :

for a new document, switching to an older document and back to "new document" seems to end the display process, creating a new entry in the documents list
for new pages on an existing document, switching to another document and back to the previous one works too

By the way, for a new document, after having the aforementioned behaviour, if I :

click on another document
then click on "new document" (as described before)
then wait for the new entry in the documents list to be created (it takes approx. 1 second)
then switch to another workspace BEFORE the page is rendered ... then, when switching back to Paperwork, the enlarged thumbnail is displayed, not the "correct quality" image for the document

tiramiseb commented 8 years ago

When the Paperwork window is hidden behind a maximized window on the same workspace, the problem does not occur.

jflesch commented 8 years ago

Looks like a Cairo rendering bug. Can you remind me which GNU/Linux distribution do you use ? And which Gnome version do you have ?

tiramiseb commented 8 years ago

I'm using Ubuntu GNOME 16.04, with GNOME Shell 3.18.

jflesch commented 8 years ago

Actually, I reproduced on Debian sid too.

I'm unsure what is happening here. No obvious bug / trace in Paperwork output.

However, from what I can see, this is not a big issue. There is pretty much no point where the user is stuck. So for now, I'm going to delay this ticket.

tiramiseb commented 8 years ago

I have switched to KDE this weekend.

On KDE, this bug does not appear when switching to another activity while scanning.

jflesch commented 7 years ago

Maybe related to #522

tiramiseb commented 7 years ago

I don't think so because #522 has no problem when adding pages to an existing documents.

jflesch commented 7 years ago

Yep, but in both cases, I suspect a Gtk/Cairo rendering issue (or worst, a main loop issue) :)

jflesch commented 7 years ago

Anyway, we will have to check if 1.1.0 (unstable) doesn't already fix the issue.

Prior to 1.1.0, I didn't call Gdk.threads_init() because it caused issues with Gtk dialogs in Paperwork. However I am clearly using threads (and a lot). Since I've solved the issues with the dialogs, I am now able to call Gdk.threads_init(). Hopefully, this is what caused these main loop issues and/or rendering problems.

If not, I'll have to do some nasty debugging sessions to find the root causes :(

jflesch commented 7 years ago

Update: Gdk.threads_init() is actually deprecated (--> wasn't included in Paperwork 1.1).

I've also installed Ubuntu Gnome ~~16.04~~ 16.10 on my desktop because it's currently the only distribution that supports correctly my graphic card with Steam ^^. Anyway, I've ended up with a bunch of weird rendering bugs in Paperwork I didn't have with Debian (stable or sid). I'm more and more suspecting bug(s) in the Glib/Cairo/Gdk/Gtk/Gnome-shell versions of Ubuntu Gnome ~~16.04~~ 16.10. And I am unable to spot where they come from yet ... :/

openpaperwork / paperwork

New scanned paged not displayed when window is not visible #515