https://bugs.documentfoundation.org/show_bug.cgi?id=148252

            Bug ID: 148252
           Summary: (LO Calc) Background Colours Malfunction = when an
                    image is sent to background, while Value Highlighting
                    is active
           Product: LibreOffice
           Version: 7.2.5.2 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: graphics stack
          Assignee: [email protected]
          Reporter: [email protected]

Description:
Background Colour Malfunction in LibreOffice Calc

MALFUNCTION 
Background colours randomly disappear & reappear, in random cells

CAUSE
Loading an image to background (Menu-Format-Arrange-To background)
whilst using
Value Highlighting (Menu-View-Value Highlighting)

CONCLUSION
Value Highlighting cannot be used if an image is in background

Steps to Reproduce:
1. LibreOffice Calc-File-New
2. Select a decent block of cells
3. Click Paint icon arrow-Select a colour
4. Select a cell in the block
5. Menu-Insert-Image (locate and open an image from a directory)
6. Whilst image is selected, Menu-Format-Arrange-To background
7. Scroll to a new section of worksheet, and scroll back 
   The colours should be stable, as expected
8. Activate Menu-View-Value Highlighting
9. Scroll around, as before, to see colours disappearing in random cells
   (displaying erratic behaviour) 

Actual Results:
Random appearance, and disappearance, of background colours 

Expected Results:
The worksheet should display background colours correctly


Reproducible: Always


User Profile Reset: No



Additional Info:
BUG confirmed by 3 independent testers
----------------
Version: 7.2.5.2 (x64) / LibreOffice Community
Build ID: 499f9727c189e6ef3471021d6132d4c694f357e5
CPU threads: 4; OS: Windows 10.0 Build 19044; UI render: Skia/Raster; VCL: win
Locale: en-GB (en_GB); UI: en-GB
Calc: CL
-----------------
Version: 7.3.1.3 (x64) / LibreOffice Community
Build ID: a69ca51ded25f3eefd52d7bf9a5fad8c90b87951
CPU threads: 8; OS: Windows 10.0 Build 22000; UI render: default; VCL: win
Locale: en-NZ (en_NZ); UI: en-GB
Calc: CL
-----------------
LO 7.3.1.3 on Ubuntu 20
-----------------

COMMENT
This BUG is bad news for any developer, because:
Value Highlighting provides at a glance knowledge of the worksheet
and
Background Colours provide at a glance knowledge of the worksheet
Both would normally be used together.

Using images as background may be required, or aesthetically pleasing.
As a background, values can be written over the images (very useful).

Background images, background colours, and value highlighting should be capable
of working together.

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