[Libreoffice-bugs] [Bug 131092] New: High CPU usage and slow performance with column selectionnnn

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=131092

            Bug ID: 131092
           Summary: High CPU usage and slow performance with column
                    selectionnnn
           Product: LibreOffice
           Version: 6.3.5.2 release
          Hardware: All
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: suokunlong at 126.com

Description:
When I do column selection in Calc, the CPU usage is very high and the
selection is very slow.

Steps to Reproduce:
1. New Calc. Type "a" in cell A1, copy A1 using Ctrl-C, select columns A:D and
paste into these columns using Ctrl-V.

2. Click any cell to release column focus, then try to select the columns.
--> So far so good, selection is very fast.

3. Continue to select columns A:D, then apply liberation serif fonts to these
columns (previously the font is liberation sans). Click any cell to release
column focus.

4. Now try to select all the A:D columns, select any cell ranges, or just
select any cell with or without content.
--> Bug - Selection is slow, CPU usage is high. It does not help at this stage
even you apply "clear direct formatting" to this columns now.

Actual Results:
See explanation in the STR.

Expected Results:
Selection should always be fast provided that this is a very basic feature. We
always do selection and move around in the spreadsheet, even through we do not
do copy-paste or other operation related to formatting after most of the
selection.


Reproducible: Always


User Profile Reset: Yes



Additional Info:
Reproduced in both Fedora 31 and Ubuntu 19.10, in both Chinese and pure English
environment.

版本: 6.3.6.0.0+
Build ID: cb957e35f54d6c4e9b8b13cd014a09bdf74327b0
CPU 线程: 4; 操作系统: Linux 5.5; UI 渲染: 默认; VCL: gtk3; 
区域语言: zh-CN (zh_CN.UTF-8); UI 语言: zh-CN
Calc: threaded

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