https://bugs.kde.org/show_bug.cgi?id=378579
Bug ID: 378579
Summary: kate (and kwrite) on large files: version 3.7 is fine,
version 15 sucks
Product: kate
Version: 15.12
Platform: Debian stable
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: kwrite-bugs-n...@kde.org
Reporter: gravesricha...@yahoo.com
Target Milestone: ---
Created attachment 104928
--> https://bugs.kde.org/attachment.cgi?id=104928&action=edit
It shows the cursor one line down from the top.
I am on kubuntu, so I get the kate (and kwrite) version the ubuntu people give
me.
I have been using kwrite to maintain a big file (25 mb). (Note that kwrite uses
the kate editor.)
On kubuntu 14.04 (kate version 3), kwrite worked great.
When I first tried kubuntu 16.04 (kate version 5/15) in early 2016, kwrite was
clearly not the same:
1. For the arrow keys, keyboard repeat works at the top of the file, but not
further down. In kate version 5/15, the display does not update -- you cannot
see where the cursor is. If you hold an arrow key down for a while and release,
after some seconds, the cursor freezes then reappears somewhere. In kate
version 3, anywhere in the file, you see exactly where the cursor is at every
instant, you can release the arrow key when you want, and the cursor is where
you expect it to be.
2. Pasting text into the file (anywhere except the top), kate version 5/15
takes several seconds for the text to appear. Using kate version 3, the text
appeared instantly.
After evaluating kubuntu 16.04 in early 2016, the kwrite problem was a show
stopper -- I declined to upgrade kubuntu, and I have been on 14.04 until
recently. But then in March, a more pressing consideration made me upgrade to
16.04, and kwrite is still a problem on my big file.
In 2016, I tried tweaking settings in hope of fixing the problem, but I did not
find a solution.
Note that I encountered this problem using the same hardware. Right now, I
have two hard drives for my Lenovo Thinkpad T500 laptop with 8 GB memory, one
hard drive with kubuntu 14.04 (kate version 3), and another hard drive with
kubuntu 16.04 (kate version 5/15). I can shut the laptop down and swap hard
drives. You can say my laptop is too slow, but kate version 3 works perfectly
OK on my laptop -- no complaints. But on the same laptop, kate version 5/15
sucks.
I have encountered deniers, so I assembled a big file -- anyone can try it
themselves. I googled "Richard Stallman", went to some hit pages, and copied
some text by or about him. I pasted into a file and duplicated. I used the fmt
utility to break the long lines into shorter lines (the file I edit in real
life has mostly short lines). The file is almost 27 mb (too big to attach). I
gzipped it, and uploaded it here:
http://www.advanced-app.com.hk/MiscJunk/Stallman_Richard_short.txt.gz
For both the following tests, I used wget to download the file and gzip -d to
extract it.
For the latter of the two tests below, see the attached picture. It shows the
cursor one line down from the top. The test, conducted near the bottom of the
file, is to determine, after pressing down arrow once, how long it takes for
the cursor to appear one line down from the top (as explained in detail below).
On the Lenovo Thinkpad T500 laptop with 8 GB memory running kubuntu 16.04 (kate
version 5/15):
I went to the bottom of the file, and from the bottom I selected up to and
including the line "The consequences:". I copied the selected text. I used PgUp
several times until I came to the heading "The GNU Manifesto". Above that
heading, I hit Paste (Ctrl-V), and counted "one thousand one, one thousand two,
one thousand three, ..." The inserted text appeared between one thousand five
and one thousand six. I hit Ctrl-Z. I pressed the up arrow key, and kept
pressing it while I counted ""one thousand one, one thousand two, one thousand
three, one thousand four, one thousand five" then I released the up arrow key,
immediately pressed down arrow once (quickly) and started counting again. The
cursor did not appear one line down from the top until AFTER I counted up to
one thousand eight.
On the SAME Lenovo Thinkpad T500 laptop with 8 GB memory, running kubuntu 14.04
(kate version 3):
I went to the bottom of the file, and from the bottom I selected up to and
including the line "The consequences:". I copied the selected text. I used PgUp
several times until I came to the heading "The GNU Manifesto". Above that
heading, I hit Paste (Ctrl-V). There was no need to count, as the inserted text
appeared instantaneously (to my human perception). I hit Ctrl-Z. I pressed the
up arrow key, and kept pressing it while I counted ""one thousand one, one
thousand two, one thousand three, one thousand four, one thousand five" then I
released the up arrow key, immediately pressed down arrow once (quickly). There
was no need to count again, as cursor had come to a stop instantaneously after
releasing the Up arrow, so the cursor moved down to the second line immediately
after pressing the Dn arrow. While I was pressing the up arrow key, the cursor
never disappeared, but moved up smoothly and continuously.
Same results using kate and kwrite. Exactly the same resuls on different
computers -- on big files, kate version 3 is fine, kate version 5/15 sucks.
My hope is the problem can be fixed, that kate version 5/15 can be a good on
big files as kate version 3.
--
You are receiving this mail because:
You are watching all bug changes.
