Bug 135982

Summary: Deleting text with backspace slows down heavily
Product: LibreOffice Reporter: Telesto <telesto>
Component: WriterAssignee: Not Assigned <libreoffice-bugs>
Status: RESOLVED WORKSFORME    
Severity: normal CC: ilmari.lauhakangas, miguelangelrv
Priority: medium    
Version: 6.4.0.3 release   
Hardware: All   
OS: All   
See Also: https://bugs.documentfoundation.org/show_bug.cgi?id=137567
Whiteboard:
Crash report or crash signature: Regression By:
Attachments: Example file

Description Telesto 2020-08-21 09:43:10 UTC 
Description:
Deleting text with backspace slows down heavily

Steps to Reproduce:
1. Open the attached file
2. Open a process monitoring tool
3. Place cursor at the end of the line of text
4. Press and hold backspace (notice slowdown on the first line) 

Actual Results:
CPU hammering & slowdown

Expected Results:
Not so


Reproducible: Always


User Profile Reset: No



Additional Info:
Found in
7.1

6.4

not in
Version: 6.2.0.0.alpha0+
Build ID: 401cba4c20fbc930f034168872642428d7459218
CPU threads: 4; OS: Windows 6.3; UI render: default; 
Locale: nl-NL (nl_NL); Calc: CL
Comment 1 Telesto 2020-08-21 09:43:26 UTC 
Created attachment 164527 [details]
Example file
Comment 2 m_a_riosv 2020-08-21 14:39:52 UTC 
I see an increased use of cpu, but response in LibreOffice it's fine for me.

Maybe in relation with the frame containing the flow-char image(2 objects) it's wrapped to 'Optimal page wrap'
Comment 3 Buovjaga 2021-07-26 17:01:34 UTC 
Nothing weird seen with perf. I don't see any frames or objects, though.

NixOS
Version: 7.3.0.0.alpha0+ / LibreOffice Community
Build ID: 67e47070a7580a17804adce812cc2f98bfe7b51f
CPU threads: 16; OS: Linux 5.13; UI render: default; VCL: x11
Locale: fi-FI (fi_FI.UTF-8); UI: en-US
Calc: threaded
Comment 4 Telesto 2021-07-27 01:31:21 UTC 
(In reply to Buovjaga from comment #3)
> Nothing weird seen with perf. I don't see any frames or objects, though.
> 
> NixOS
> Version: 7.3.0.0.alpha0+ / LibreOffice Community
> Build ID: 67e47070a7580a17804adce812cc2f98bfe7b51f
> CPU threads: 16; OS: Linux 5.13; UI render: default; VCL: x11
> Locale: fi-FI (fi_FI.UTF-8); UI: en-US
> Calc: threaded

Track changes ->  show will popup the hidden content

But I'm not noticing anything off either.. 
Version: 7.3.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: 2a151d1d5bc055d5e0011460b6ec42ea9f34f880
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win
Locale: nl-NL (nl_NL); UI: en-US
Calc: CL