[konsole] [Bug 410748] New: Font rendering changes to grayscale once any amount of transparency is applied

[Ryan Reamsbottom]

https://bugs.kde.org/show_bug.cgi?id=410748

            Bug ID: 410748
           Summary: Font rendering changes to grayscale once any amount of
                    transparency is applied
           Product: konsole
           Version: 19.04.3
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: font
          Assignee: konsole-devel at kde.org
          Reporter: ryanrms at gmail.com
  Target Milestone: ---

Created attachment 122030
  --> https://bugs.kde.org/attachment.cgi?id=122030&action=edit
showing the bug zoomed in on the font in a man page, solid on the left
semitransparent on right

Not sure if this is intended behavior, but when you switch the background of
Konsole to use a transparent background (with blur looks nice!), the font
rendering setting appears to change.

STEPS TO REPRODUCE
1. Set your font rendering to RGB subpixel
2. Open Konsole (restarting it if already opened)
3. Change background to include transparency

OBSERVED RESULT
Konsole renders fonts with grayscale font smoothing when the background is
transparent, even if the setting is for RGB. The titlebar is rendered with rgb
but not the semitransparent window content. This may be a limitation with
transparency but I'm not sure just a layman.



EXPECTED RESULT


SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.16
KDE Plasma Version: 5.16.4
KDE Frameworks Version: 5.60.0
Qt Version: 5.12.3
Kernel Version: 5.0.0-23-generic
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-3770 CPU @ 3.40GHz
Memory: 15.6 GiB of RAM

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