Created attachment 128072 [details]
window with multiple tabs open (thin window)

SUMMARY
While it totally makes sense that tabs with a lot of text get a lot of the space, there should be some limit, because the shorter the tab text, the more important each letter is for recognizing which folder that tab corresponds to.


STEPS TO REPRODUCE
1. on command line: cd /tmp && mkdir test && cd test && mkdir "2019 - normal folder name" && mkdir "relatively short folder name" && mkdir "this is a very long folder name that dominates all other tabs which seems a bit suboptimal since the user probably would be okay with just the beginning"

This is what the directory tree looks like:

/tmp/test
├── 2019 - normal folder name
├── relatively short folder name
└── this is a very long folder name that dominates all other tabs which seems a bit suboptimal since the user probably would be okay with just the beginning


2. Enter /tmp/test in Dolphin and open the tabs in Dolphin


OBSERVED RESULT
The tab for the folder with the very long name takes almost all the space of the tab bar. Resizing the window gives the tab that's already pretty long even more space. (See attachments.)


EXPECTED RESULT
For the tabs with little text to get enough space to make them (more) readable. I actually had the problem where a long folder name was making it hard to discern what the other tabs contain.

I've attached a Python file to illustrate how that algorithm could work. (Basically it adds the length of each tab text to a list. Then it brings each length in that list nearer to the average of said list.)


This is the output:


# length   name

    25:    2019 - normal folder name
    28:    relatively short folder name
   152:    this is a very long folder name that dominates all other tabs which seems a bit suboptimal since the user probably would be okay with just the beginning

average tab length: 68.33333333333333

 43.78:    2019 - normal folder name
 44.27:    relatively short folder name
 82.00:    this is a very long folder name that dominates all other tabs which seems a bit suboptimal since the user probably would be okay with just the beginning


Simulate tab bar (I know it's a lot more complex in reality)
------------------------------------------------------------

| 2019 - normal fold… | relatively short f… | this is a very long folder name t… | 



SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 18.04
KDE Plasma Version: 5.12.9 
KDE Frameworks Version: 5.47.0
Qt Version: 5.9.5

It would be cool if someone could test if this is still an issue in the latest version. (following the above steps to reproduce).


Thanks for KDE =)