Description: Choppy scrolling in multi-page view; especially with OpenGL enabled but also noticeable without Steps to Reproduce: 1. Open the attached file 2. Go to multipage view (3 pages in a row) 3. Scroll down (notice a lag & higher CPU usage compared to prior versions) Actual Results: Lag Expected Results: Smooth scrolling Reproducible: Always User Profile Reset: No OpenGL enabled: Yes Additional Info: Version: 6.2.0.0.alpha1+ Build ID: 4fa9e6f7f891b335ae1b432e0848c1e46c8fe3ef CPU threads: 4; OS: Windows 6.3; UI render: GL; VCL: win; TinderBox: Win-x86@42, Branch:master, Time: 2018-10-30_22:44:48 Locale: nl-NL (nl_NL); Calc: CL
Created attachment 146212 [details] Example file
Created attachment 146213 [details] Bibisect log Bisected to: author Tor Lillqvist <tml@collabora.com> 2015-08-12 08:18:50 +0300 committer Tor Lillqvist <tml@collabora.com> 2015-08-12 09:14:20 +0300 commit 4667db065d34193d99bce82f7e8f3b20a03ecade (patch) tree 405ac0a286040b8a983701f167c583c45691685b parent 695cec87d73d56617e1cdc62621971ab35ac67eb (diff) Drop SimpleWinLayout Use Uniscribe also for non-complex text. It is complicated enough to have separate Graphite and Uniscribe layout engines. Will make further changes to the code easier to manage, especially as with the UniscribeLayout code we have access to the actual glyphs. (Cf. 3e47219e06b9a279ba22a9bbef668731f2d3e07d) https://cgit.freedesktop.org/libreoffice/core/commit/?id=4667db065d34193d99bce82f7e8f3b20a03ecade
Version: 6.3.0.0.alpha0+ (x64) Build ID: 0f25a3c36f27fd51453b9a9115f236b83c143684 CPU threads: 8; OS: Windows 10.0; UI render: GL; VCL: win; TinderBox: Win-x86_64@42, Branch:master, Time: 2018-11-27_20:06:55 Locale: zh-TW (zh_TW); UI-Language: en-US Calc: threaded The new version doesn't have the problem.
I'm still experiencing a lag Version: 6.3.0.0.alpha0+ Build ID: f21d2b48bd68424a96aa6cd5572e368208378291 CPU threads: 4; OS: Windows 6.3; UI render: default; VCL: win; TinderBox: Win-x86@42, Branch:master, Time: 2018-11-27_00:26:54 Locale: en-US (nl_NL); UI-Language: en-US Calc: CL
I can confirm that the bug is present. I can definitely see the difference in scroll between normal page view and multi page view in my version. Version: 6.0.6.2 Build ID: 0c292870b25a325b5ed35f6b45599d2ea4458e77 CPU threads: 2; OS: Windows 6.1; UI render: default; Locale: en-US (en_US); Calc: group
Adding Cc: to Tor Lillqvist