outline pane issues and huge note slowness

Richard Kimberly Heck rikiheck at lyx.org
Mon Feb 8 22:03:24 UTC 2021

On 2/8/21 5:56 AM, Jean-Marc Lasgouttes wrote:
> Le 05/02/2021 à 22:50, V K a écrit :
>> Manjaro linux, sway, wayland laptop Lenovo X1 yoga (1st generation) 
>> (CPU: Dual Core Intel Core i7-6600U (-MT MCP-) speed/min/max: 
>> 699/400/3400 MHz Kernel: 5.10.7-3-MANJARO x86_64 Up: 7h 04m Mem: 
>> 6805.1/15417.2 MiB (44.1%) Storage: 476.94 GiB (90.0% used) SSD NVMe) 
>> Open note inset and scroll down (I'm scrolling with touchpad), note 
>> content must be wisible in Lyx work area. The faster scroll, the 
>> higher CPU usage, but document moves very slowly and with quite a big 
>> delay and with big jumps. wayland can be the culprit. I opened lyx in 
>> xwayland mode and I can scroll through the note only slowly – after 
>> scrolling fast document are thrown back to initial position. CPU 
>> usage about 70%. In wayland – 99% if scrolling is intensive, up and 
>> down.
> I can confirm the issue with Wayland. I unfortunately did not find 
> easy way to mitigate the issue. I have idea for a proper fix, but it 
> is a lot of work. I have been successful at procrastinating on that 
> because nobody complained. Now that I have a real use case, I will 
> have to do something about it ;)
> The difficulty that we have is that, if we only compute metrics for 
> the text visible on screen, we do not know what the width of the inset 
> is (think a tall table for example). So either we can make the metrics 
> process fast enough (which remains to be seen) or we have to find 
> clever ways to typeset only parts of the inset.

Why does the typesetting part take longer on Wayland?


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