Bug 134262

Summary: Scrolling down in multipage view (8 pages a row) barley moving (GDI+SKIA) since new Layout Engine (part 1)
Product: LibreOffice Reporter: Telesto <telesto>
Component: WriterAssignee: Not Assigned <libreoffice-bugs>
Status: RESOLVED WORKSFORME    
Severity: normal CC: 79045_79045, xiscofauli
Priority: medium    
Version: 7.1.0.0.alpha0+   
Hardware: All   
OS: All   
See Also: https://bugs.documentfoundation.org/show_bug.cgi?id=134263
Whiteboard:
Crash report or crash signature: Regression By:
Bug Depends on:    
Bug Blocks: 108075    
Attachments: Example file

Description Telesto 2020-06-23 12:17:36 UTC 
Description:
Scrolling down in multipage view (8 pages a row) stutters/slow/barley moving (GDI+SKIA)

Steps to Reproduce:
1. Open the attached file
2. Go to multi-page view -> 8 page a row (move the sidebar change zoom to get 8 pages)
3. Scroll down

Actual Results:
Choppy/ no movement

Expected Results:
Smooth


Reproducible: Always


User Profile Reset: No



Additional Info:
Found in
Version: 7.1.0.0.alpha0+ (x64)
Build ID: 43c60ce1ac7629a1462e927e6ff937469f58f743
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: default; VCL: win
Locale: nl-NL (nl_NL); UI: en-US
Calc: CL

and in
Version: 6.0.6.0.0+
Build ID: c30963b8b4bbbe42a24b97aafa161eff9d7ccdd4
CPU threads: 4; OS: Windows 6.3; UI render: default; 
Locale: nl-NL (nl_NL); Calc: CL

and in
5.4

slow with
Version: 5.3.0.3
Build ID: 7074905676c47b82bbcfbea1aeefc84afe1c50e1
CPU Threads: 4; OS Version: Windows 6.2; UI Render: default; Layout Engine: new; 
Locale: nl-NL (nl_NL); Calc: CL

Only the new Layout Engine; fine with OLD
Comment 1 Telesto 2020-06-23 12:18:53 UTC 
Created attachment 162348 [details]
Example file
Comment 2 Roman Kuznetsov 2020-08-06 18:33:26 UTC 
no problem in

Version: 7.1.0.0.alpha0+ (x64)
Build ID: <buildversion>
CPU threads: 4; OS: Windows 10.0 Build 18363; UI render: Skia/Vulkan; VCL: win
Locale: ru-RU (ru_RU); ИП: ru-RU
Calc: threaded

build from 31 July 2020

not in vcl:win

Telesto, should we scroll with mouse wheel?
Comment 3 Telesto 2020-08-06 18:41:02 UTC 
Feels pretty OK, not remembering the speed when I reported this initially. However there where some Skia improvements..

Version: 7.1.0.0.alpha0+ (x64)
Build ID: <buildversion>
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win
Locale: ru-RU (nl_NL); UI: en-US
Calc: CL