Pattern containing clipped object freezes in Document in cm units
<details><summary>Original Report</summary> The template works fine up until the repeat layer as i have already taken these steps multiple times on different projects on the layer repeat where my pattern is i just copied the original pattern tile from layer pattern foreground into repeat layer and then just got the copied pattern tile clicked on it with the arrow icon 3-4 times to get a box up around it and i got the small box in the right hand bottom corner of the tile pushed it up a very small amount so the pattern got a little smaller, now there is a second small box where the first small box is now i grab the second small box and pulled the pattern right out until it was at my desired measurements. I then went to change all my measurements to cm instead of px by going into document properties. I was going to go back into export file and change the measurements to cm there also but my document on Inkscape kept freezing up and not responding so now i cannot get in there to alter measurements hope someone can help me with this thankyou. My file is attached![fruitstestcheck.svg](/uploads/250f83d2aa95790b0afa453d831e1367/fruitstestcheck.svg) </details> #### Steps to reproduce: - open [fruitstestcheck.svg](/uploads/f0ff3d6ccac86d8a25f888644221a0b0/fruitstestcheck.svg) in Inkscape - This file has a large pattern - objects in the pattern have a clip in it - File entered bad state after changing document units to cm - Opening the file in a text editor and changing the width/height to mm (and multiplying the values by 10) fixes the issue #### What happened? - All versions: CPU constantly high - 1.0 and later: Inkscape is frozen - 0.92.x: Inkscape is laggy, and after file is opened, new widgets/dialogs/menus simply dont' show #### What should have happened? - CPU isn't continually running. No re-rendering should be necessary if there are no changes - no freeze - Shouldn't matter what units we change the document to. Sample attachments: ![fruitstestcheck.svg](/uploads/e58f33bd4dbe3ee061e6e623ef8730e9/fruitstestcheck.svg) Also more minimal file that freezes 1.1-alpha (warning, has same name as original file) [fruitstestcheck.svg](https://gitlab.com/inkscape/inbox/uploads/e0ee349de34b34c596f04427d3bb9fc7/fruitstestcheck.svg) #### Version Info: - See comments below, still happens in Inkscape 1.1-alpha (45525c9ea5, 2021-04-03)
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