[Libreoffice-bugs] [Bug 121860] New: Marking of cells (more than 10) by means of STRG+Left Mouse Click becomes very slow

[b***@bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121860

Bug ID: 121860
Summary: Marking of cells (more than 10) by means of STRG+Left
Mouse Click becomes very slow
Product: LibreOffice
Version: 6.1.3.2 release
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Calc
Assignee: libreoffice-***@lists.freedesktop.org
Reporter: ***@online.de

After 10-15 cells are selected by STRG+Mouse Click there is a significant loss
of speed in marking others. The more you choose the longer one have to wait
until cells selection is shown.

[b***@bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121860

--- Comment #1 from ***@online.de ---
Steps to reproduce:
1 Open a calc sheet
2 press and hold STRG and mark several cells or ranges (between 10-15)

Actual Results:
Calc needs more time to show cells selection the more you try to mark

Expected Results:
Stable performance while marking cells

Reproducible: Always

[b***@bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121860

--- Comment #2 from Durgapriyanka <***@gmail.com> ---
Thank you for reporting the bug. I cannot reproduce the bug in

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

[b***@bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121860

--- Comment #3 from ***@online.de ---
Made some additional tests related to this.
After application restart the behavior occurs between 20-30 cells that are
marked
Second try with same sheet still open between 10-20 cells
Seems that the more often you try the earlier the application slows down.
CPU usage goes up to 100 percent while marking.

[b***@bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121860

***@online.de changed:

What |Removed |Added
----------------------------------------------------------------------------
Summary|Marking of cells (more than |System slows down while
|10) by means of STRG+Left |marking a lot of cells by
|Mouse Click becomes very |means of STRG+Left Mouse
|slow |Click

[b***@bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121860

***@online.de changed:

What |Removed |Added
----------------------------------------------------------------------------
Summary|System slows down while |System slows down while
|marking a lot of cells by |marking a lot of cells by
|means of STRG+Left Mouse |means of Ctrl+Left Mouse
|Click |Click

[b***@bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121860

--- Comment #4 from ***@online.de ---
Another notice:
Bug seems to be in connection with marking of several SINGLE cells only.

Bug does not come up if one or more ranges are marked at first that contain a
lot of cells before single cells are additionally(!) marked.
Then a huge number of single cells can be marked without any system slow-down.

Bug does come up if a lot of single cells are marked.

[b***@bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121860

***@online.de changed:

What |Removed |Added
----------------------------------------------------------------------------
Summary|System slows down while |System slows down while
|marking a lot of cells by |marking a lot of single(!)
|means of Ctrl+Left Mouse |cells by means of Ctrl+Left
|Click |Mouse Click