[Konsole-devel] [konsole] [Bug 365339] New: Several seconds delay switching to certain tabs

[Andreas Hartmetz via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=365339

            Bug ID: 365339
           Summary: Several seconds delay switching to certain tabs
           Product: konsole
           Version: master
          Platform: Compiled Sources
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: ahartmetz at gmail.com

I like to use infinite scrollback. Since recently, it takes several seconds to
switch to tabs with many thousands of lines of scrollback, such as from
compiling a large project with qmake. From the attached backtrace (and other
gdb info dump) it looks like konsole's filtering for highlighting etc. is what
is taking so long. I think it's probably scanning more than it has to, which
would be really just the current screen. And it probably handled it more
cleverly before.
Needless to say, the current behavior is quite annoying.

Reproducible: Always

Steps to Reproduce:
1. Get a few thousand lines of scrollback in a tab (compiling something with
qmake works well)
2. Make sure that the scrollback is still growing (konsole is smart enough not
to rescan completely constant contents)
3. Switch to another tab
4. Switch back to the tab with lots of lines

Actual Results:  
konsole hangs for some time before the tab with the long scrollback is shown.

Expected Results:  
konsole shows the tab with the long scrollback quasi-instantly, which it used
to do before.

I think this is major because it kind of kills the infinite scrollback feature
and even makes tab switching with "just" 1000 lines a bit slower.

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