[Webkit-unassigned] [Bug 199770] New: Blur Filter causes element to get cut off over multiple screens

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199770

            Bug ID: 199770
           Summary: Blur Filter causes element to get cut off over
                    multiple screens
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: thomas.kool.12 at gmail.com

Created attachment 374056

  --> https://bugs.webkit.org/attachment.cgi?id=374056&action=review

Test script displays the bug, uses javascript to generate text

Overview:
When using the blur filter on an element, it cuts off the element around what I estimate to be ~4000px. When you try to measure it using development tools, it suddenly comes correct.

Steps to reproduce:
1) Stretch out a browser using webkit to span multiple screens
2) Load a file containing a blur filter on an element (see attached one provided)

Actual Results:
The element gets cropped at ~4000px across and no content from the element can be seen anymore past this point, The blur also completes but leaves a hard edge on the edge where it gets cropped

Expected Results: 
The full element, with all contained text should be displayed across the page

Build Date & Hardware:
13 July 2019 on Manjaro Linux 

Additional Builds and Platforms:
 The following both have the problem:
   - lightdm-webkit2-greeter (v2.2.5)
   - Midori (v8.0)
 On Firefox (v67.0 x64) this does not occur

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