[konsole] [Bug 483012] New: Changing line spacing for a Konsole profile causes misalignment until application restart

[Luke Horwell]

https://bugs.kde.org/show_bug.cgi?id=483012

            Bug ID: 483012
           Summary: Changing line spacing for a Konsole profile causes
                    misalignment until application restart
    Classification: Applications
           Product: konsole
           Version: 24.02.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: font
          Assignee: konsole-devel at kde.org
          Reporter: code at horwell.me
  Target Milestone: ---

Created attachment 166812
  --> https://bugs.kde.org/attachment.cgi?id=166812&action=edit
Screenshot after changing line spacing to 16px

SUMMARY

In Konsole 24.02.0, changing the line spacing for a profile causes the terminal
to be misaligned (in some cases unreadable) until the application is restarted.
This is also problematic if the user switches to a profile using different line
spacing settings, unless it is the default profile.


STEPS TO REPRODUCE
1. Settings → Create/Edit a profile (use CTRL+ALT+M to show menu bars if
hidden) 
2. Appearance → Miscellaneous
3. Set the line spacing to 8px.
4. Run an application like "nano" to observe text.

OBSERVED RESULT
The line spacing is broken, causing unreadable text, depending on the line
spacing. This is a regression since Konsole 23.08.5 (Qt 5).

EXPECTED RESULT
Changing line spacing (via settings or switching profiles) render correctly
without needing to restart Konsole.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  Arch Linux
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION
Tested under X11.

Observation for other users -- opening a new Konsole window (24.02.0, Qt 6) did
seem smaller to its 23.08.5 (Qt 5) version after upgrading, then I found out
line spacing wasn't applying properly and also needs a 1 pixel bump. I had it
set to 1px up to now, but 2px makes it familiar again to how it was prior to
upgrading (after restarting Konsole, of course!)

Appreciate the line spacing option, a nice feature for dyslexa users!

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