Sometimes drag and drop fails

[GoogleCodeExporter]

First of all, it doesn't happen necessarily every time as I have issues 
reproducing it, but it is definitely there.

What steps will reproduce the problem?
1. Add a gradient rectangle to the canvas which covers the TOP as in :
   gradientRectangle.Width = canvas.Width
   gradientRectangle.Height = A few hundred pixels
2. Add a Box to the canvas which covers the LEFT of the canvas as in :
   box.Width = A few hundred pixels
   box.Height = canvas.Height
3. Add a table to the canvas at the bottom right, doesn't matter where
4. Add a link to the canvas at the bottom right, anywhere

What is the expected output? What do you see instead?
I expect all the items to be drag and dropped where I put them. Instead it 
seems the table is dropped I cannot add anything any more. The only thing to do 
is to restart to app to keep going.

What version of the product are you using? On what operating system?
v1.3.4

Please provide any additional information below.
I'm running the standalone version on win7/x64

Julien

Original issue reported on code.google.com by julien.b...@gmail.com on 25 Jul 2012 at 10:06

[GoogleCodeExporter]

I have this problem under Windows 7 64-bit standalone and under Ubuntu 12.04 
running via Firefox (15.0.1). Problem appears to be specific to what is being 
dragged. Some objects refuse to drag at all. Some will work on a new page but 
then fail as soon as something else is added. There doesn't appear to be any 
clear reason why.

Steps to reproduce running within firefox on Ubuntu 12.04.  
1. Create new page.
2. Drag Rectangle on to page.
3. Drag oval onto page.

Step 3 fails. It cannot be dragged onto the page. Attempting to add a new 
rectangle also fails until a new page is open.

Effectively the problem makes Pencil unusable both under Windows 7 (64-bit) as 
standalone and within Firefox under Ubutnu 12.04. 

I would suggest that the priority is increased from medium to a higher level as 
currently the tool is unusable in the environments I have tested.

Original comment by james.g....@gmail.com on 14 Sep 2012 at 11:38

[GoogleCodeExporter]

While doing further testing have determined that under the Ubuntu 12.04/Firefox 
environment that the drag failure is related to the speed of the drag 
operation. 

If the drag is slow enough then the drag to add a shape to the page works 100% 
of the time.

If the drag action is above a certain speed then the drag fails.

This appears to be the reason why it's hard to recreate as speed of the drag 
operation is what affects the failure of the page to become a target. It 
appears that what happens is the page is made a target of the drag operation 
briefly, but then the page is removed as a drag target, thus stopping the drag 
operation to work. 

The work around is to drag slowly. It is possible that this is a problem for 
people who have enabled fast acceleration of their mouse (which I have, on both 
environments). The reason for enabling fast acceleration is because on 
environment makes use of a 30 inch monitor and the other uses two large 
monitors.

Original comment by james.g....@gmail.com on 14 Sep 2012 at 11:46