[dolphin] [Bug 468424] New: Input field to rename files only shows a single line when the text has multiple lines due to line breaks

[postix]

https://bugs.kde.org/show_bug.cgi?id=468424

            Bug ID: 468424
           Summary: Input field to rename files only shows a single line
                    when the text has multiple lines due to line breaks
    Classification: Applications
           Product: dolphin
           Version: 22.12.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: postix at posteo.eu
                CC: kfm-devel at kde.org
  Target Milestone: ---

STEPS TO REPRODUCE
1. Copy the following text to the clipboard:
ABC
DEF
GEF.txt

2. Create a new file in Dolphin and paste the text into it
3. Rename the file again by hitting F2

OBSERVED RESULT
At step 2. after pasting the text with line breaks, the input field has
multiple lines, which makes it easy to work with the pasted text. 
At step 3. the input field for the renaming only shows a single line and only
single line at once of the multi line text.

EXPECTED RESULT
It would be useful if the rename input field showed always all lines.
It would also be useful if it asked to replace the line breaks with spaces.

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20230411
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.8
Kernel Version: 6.2.9-1-default (64-bit)
Graphics Platform: Wayland

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