https://bugs.documentfoundation.org/show_bug.cgi?id=173447

            Bug ID: 173447
           Summary: FILESAVE My XLSX file gets inflated in size (>10
                    times) with version 24.2 and above when copying sheets
           Product: LibreOffice
           Version: 24.2.7.2 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: [email protected]
          Reporter: [email protected]

Description:
I've been copying sheets in the same document for years, it has to be in XLSX
format.
After Ubuntu upgrade and moving from Libreoffice 7.3 to 24.2.7.2 with it, when
I duplicate a sheet and save the file, instead of ~150 kiB it is more than 2
MiB long.

Steps to Reproduce:
1. Open my XLSX document (contains one sheet). (If You wish, edit something and
save again as XLSX: document remains reasonably long, i. e. 76,8 kiB.)
2. Duplicate or copy that one sheet.
3. Save: filesize will inflate to 2,1 MiB. (If You delete the new sheet and
save again, filesize drops to previous 76,8 kiB.)

Actual Results:
Filesize unreasonably surged (~25-times expected size – 2,1 MiB).

Expected Results:
Normal filesize, corresponding to increase in content (duplication of only one
sheet → approx. double the size of the resulting XLSX file).


Reproducible: Always


User Profile Reset: No

Additional Info:
Tested with various versions.
Version NOT showing the problem:
Version: 7.3.7.2 / LibreOffice Community
Build ID: e114eadc50a9ff8d8c8a0567d6da8f454beeb84f
CPU threads: 16; OS: Linux 6.8; UI render: default; VCL: gtk3
Locale: sk-SK (sk_SK.UTF-8); UI: en-US
Calc: threaded

Other two versions I've tried, both showing the problem:
1)
Version: 24.2.7.2 (X86_64) / LibreOffice Community
Build ID: 420(Build:2)
CPU threads: 16; OS: Linux 6.8; UI render: default; VCL: gtk3
Locale: sk-SK (sk_SK.UTF-8); UI: sk-SK
Ubuntu package version: 4:24.2.7-0ubuntu0.24.04.6
Calc: threaded
2)
Version: 26.2.6.3 (X86_64)
Build ID: 8221e31b3ac356a1623c672912a3d2b492f7e3d1
CPU threads: 16; OS: Linux 6.8; UI render: default; VCL: gtk3
Locale: sk-SK (sk_SK.UTF-8); UI: en-US
Calc: threaded

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