https://bugs.documentfoundation.org/show_bug.cgi?id=119286

            Bug ID: 119286
           Summary: Sanitize documents using "Find & Replace" getting
                    slower and slower
           Product: LibreOffice
           Version: 5.2.5.1 release
          Hardware: All
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: [email protected]
          Reporter: [email protected]

Description:
Sanitize documents using "Find & Replace" getting slower and slower

Steps to Reproduce:
1. Open the attached file 
2. Disable the automatic spell checking if enabled

In the Search for field put "." (a single period)
In the Replace with field put "x"
Make sure Whole words only is unchecked
Click Other Options to expand the dialog, and make sure Regular expressions is
checked
Click Replace All


Actual Results:
5 seconds with LibO 4.4.7.2
12 seconds with LibO 5.2.5.0
20 seconds with LibO 6.2.0.0 (and dialog acts as if LibO won't react)

Difference between 5.2.5. and 6.2.0.0 might be Harfbuzz common layout

Expected Results:
Something like 4.4.7.2 would be ideal. At least some improvement


Reproducible: Always


User Profile Reset: No



Additional Info:
Found in
Version: 6.2.0.0.alpha0+
Build ID: c0fdcece6b886912618deee9656cb2d169a9b999
CPU threads: 4; OS: Windows 6.3; UI render: default; 
TinderBox: Win-x86@42, Branch:master, Time: 2018-08-12_00:35:45
Locale: en-US (nl_NL); Calc: CL

and in
Version: 5.2.5.0.0+
Build ID: 78223678b7513ffe46804cb08f2dc5bc899b2bab
CPU Threads: 4; OS Version: Windows 6.29; UI Render: default; 
Locale: nl-NL (nl_NL); Calc: CL

but not in
Versie: 4.4.7.2 
Build ID: f3153a8b245191196a4b6b9abd1d0da16eead600
Locale: nl_NL

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