[Libreoffice-bugs] [Bug 129420] New: Decrease performance when select many aleatory cells with Ctrl pressed.

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=129420

            Bug ID: 129420
           Summary: Decrease performance when select many aleatory cells
                    with Ctrl pressed.
           Product: LibreOffice
           Version: 6.0.7.3 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: yeinier.ferras at gmail.com

Description:
If you keep the Ctrl key pressed to select for example alternate cells
(A1,A3,...,A9,B2,B4,...,B10,C1,C3,...,C9,D2,D4,...,D10, And so on)
Eventually at certain point LibreOffice Calc slows down this process to the
point is almost impossible to select anymore or do something else in the app.

This problem happened to me when I tried to do the simulation in this video:
https://www.youtube.com/watch?v=VVQZ7QPWoh8
Then I reproduced this problem in a blank document selecting aleatory cells.

Steps to Reproduce:
1.Open LibreOffice Calc.
2.Select at least more than 10 aleatory cells.
3.That's all.

Actual Results:
The process of keeping selecting cells becomes slowly to the point is almost
impossible to continue. 

Expected Results:
The application must select cells in a fluent way, no matter how you selected. 


Reproducible: Always


User Profile Reset: No



Additional Info:
[Information automatically included from LibreOffice]
Locale: en-US
Module: SpreadsheetDocument
[Information guessed from browser]
OS: Linux (Linux Mint 19.2 Cinnamon)
OS is 64bit: yes
-----------------------------------
[Help - About LibreOffice]
Version: 6.0.7.3
Build ID: 1:6.0.7-0ubuntu0.18.04.10
CPU threads: 16; OS: Linux 5.3; UI render: default; VCL: gtk3; 
Locale: en-US (en_US.UTF-8); Calc: CL
-----------------------------------
[Other information about SO and HW]
Linux Kernel: 5.3.0-24-generic
Processor: AMD Ryzen 7 1700 Eight-Core Processor × 8
G.Card: Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 550 640SP / RX
560/560X]
------------------------------------
[The entire output of 'glxinfo | grep OpenGL']:
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: Radeon RX 560 Series
OpenGL core profile version string: 4.6.13572 Core Profile Context
OpenGL core profile shading language version string: 4.60
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 4.6.13572 Compatibility Profile Context
OpenGL shading language version string: 4.60
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile
OpenGL extensions:
OpenGL ES profile version string: 4.6.13572 Compatibility Profile Context
OpenGL ES profile shading language version string: 4.60
OpenGL ES profile extensions:

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