[konsole] [Bug 432940] New: Light font on dark background is rendered too thick

[Pedro Cunha]

https://bugs.kde.org/show_bug.cgi?id=432940

            Bug ID: 432940
           Summary: Light font on dark background is rendered too thick
           Product: konsole
           Version: 20.12.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: font
          Assignee: konsole-devel at kde.org
          Reporter: apcunha at pm.me
  Target Milestone: ---

Created attachment 135684
  --> https://bugs.kde.org/attachment.cgi?id=135684&action=edit
Konsole on the left, mockup on the right

SUMMARY
Some fonts (Source Code Pro, Fira Mono) are rendered too thick when using light
on dark color themes. This does not happen with every font (currently, I have
only experienced it with these two).
Other terminal emulators don't have the same problem (GNOME terminal, xterm,
rxvt tested).

STEPS TO REPRODUCE
1. Set font to Source Code Pro, regular weight
2. Set color theme to White on Black
3. Compare font thickness to the one using color theme Black on White.

OBSERVED RESULT
Konsole's font is rendered a little bit thicker than  it is if one uses a Dark
on light color theme.

EXPECTED RESULT
Font thickness should not depend on the color theme selected.
Using the screenshot I attached, I would expect rendering to be more like the
bottom-left and bottom-right examples.

SOFTWARE/OS VERSIONS
I have experienced this bug since Kubuntu 18.04 LTS, but for the purposes of
this bug-report I installed openSUSE Tumbleweed on a VM.

OS: openSUSE Tumbleweed 20210210
Qt version: 5.15.2
KDE Plasma: 5.20.5
KDE Frameworks version: 5.78.0

ADDITIONAL INFORMATION
I have provided a simples screenshot. On the left I have two real Konsole
windows, the top one with a White on Black theme, the bottom one with a Black
on White theme.
On the right I have copied the left two windows and inverted their colors with
an image editor, so as to simulate the font rendering from the left with
inverted color themes.

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