[dolphin] [Bug 439684] New: Ability to force unhide dot files [feature request]

[Ashark]

https://bugs.kde.org/show_bug.cgi?id=439684

            Bug ID: 439684
           Summary: Ability to force unhide dot files [feature request]
           Product: dolphin
           Version: 21.04.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: view-engine: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: ashark at linuxcomp.ru
                CC: kfm-devel at kde.org
  Target Milestone: ---

Everybody knows that you can "hide" a file by naming it with leading dot. But
this is often inappropriate and you want a deeper control of managing what is
hidden and what is not.

There is a mechanism for hiding files/folders that are not starting with dot.
You create a file named ".hidden" in the directory of interest, write there
file names line by line. And effectively hide unwanted files.

But currently, there is no mechanism to do the opposite thing. You may want to
force keep some dot files to be visible even after you disable viewing of
hidden files with ctrl + h.

I suggest adding that second half of the controlling mechanism.

STEPS TO REPRODUCE
I have a project folder (git repository). There is a subfolder "__pycache__"
and I want to keep it always hidden. And there is ".SRCINFO" file and I want it
to be always visible (because I want to comfortably see when it changes, the
git plugin in dolphin marks changed and unchanged files).

OBSERVED RESULT
I am unable to do so. I either see the unwanted "__pycache__" (while checking
if .SRCINFO changed) or I do not see ".SRCINFO" (while hiding unwanted
__pycache__).


EXPECTED RESULT
Like in .gitignore, I think it is good to support "!" at the beginning of the
file name to mark opposite meaning. So adding the file ".hidden" to the folder
of interest with the following content should solve the task:

```
__pycache__
!.SRCINFO
```

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.22.3
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2

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