Re: GNUstep app fails on Ubuntu 16 - found workaround

[Andreas Höschler]

Hi Fred,

Thank you Andreas for this huge amount of data. It seems to show that my guess was wrong. The problem is not happening in the GSHorizontalTypesetter and all the extra rects that are shown look correct. But when ever a wrong height shows up it looks like these lines:

2020-05-09 20:19:40.720 SOObjectBrowser[4163:4163] cache_lookup hit 1
2020-05-09 20:19:40.720 SOObjectBrowser[4163:4163] In attributed string and got result from  c->usedRect {x = 0; y = 0; width = 1; height = 1e+07}

First a cache hit in the string drawing code and then the wrong height, but that height never seems to get produced by the NSLayoutManager. This must point to an error in the cache itself. I found that we do not clean the „used“ flag for the cache when setting it up. Could it be that you are just picking up a random cache entry? I am not sure about that but hacked together a fix hat initialises the cache entries as unused explicitly. Could you please pull the current code from the GNUstep repository and try again with that? This will also include my other attempts in fixing this issue. They should at least not do any harm.

I have repulled libs-gui from git and the problem is gone. My 

2020-05-09 20:19:40.765 SOObjectBrowser[4163:4163] Got height 10000004.000000. We correct this ...

workaround is no longer triggered. 

Thanks a lot for your effort!!

On 10 May 2020, at 23:57, Riccardo Mottola <riccardo.mottola@libero.it> wrote:

I remember this, I have a déjà-vu here! Don't remember the App, but chasing down exactly this issue, I remember that it should be at least "one line" height and that there were issue.

According to my google search result forwarded a couple of days ago this issue indeed popped up for others as well. One app that apparently triggered it was ProjectCenter. I have never looked into the ProjectCenter code. But the problem must have occurred in all apps that do auto resizing of the interface using [NSControl sizeToFit] and have image only buttons (obviously a rather seldom combination). :-)

Best wishes,

 Andreas