[konsole] [Bug 503586] Poor search performance

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=503586

--- Comment #2 from kndevl at outlook.com ---
It's fairly trivial to reproduce with a large scrollback buffer, so I had
elided the steps. Anyway, here are the steps

1. Change the Konsole profile -> Scrolling -> Scrollback: Unlimited 
2. Run `yes "foo bar foo" | head -n 100000`
3. Press Ctrl + Shift + F to open the search panel
4. Type "foo"
5. Konsole freezes for a while

If it does not freeze on your machine, increase 100000 to a larger number. 

Expected: 

1. Konsole must be usable when search runs (scrolling, clicks)
2. Search must continue to highlight matching tokens in the visible text while
the full search is running

Actual:

1. Konsole freezes until search is complete
2. This is a major regression in the new version and completely breaks my
workflow. Depending on the scrollback buffer, search is now unpredictable and
freezes the terminal. Previously, one could search in large buffers without any
delay. 

Because this is a regression and breaks a key feature of a typical linux
terminal application, I think it should be more important than NORMAL priority.

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