[konsole] [Bug 401094] New: Malayalam rendering regression in Konsole 18.08

[Rajeesh K V]

https://bugs.kde.org/show_bug.cgi?id=401094

            Bug ID: 401094
           Summary: Malayalam rendering regression in Konsole 18.08
           Product: konsole
           Version: 18.08.1
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: font
          Assignee: konsole-devel at kde.org
          Reporter: rajeeshknambiar at gmail.com
  Target Milestone: ---

Created attachment 116335
  --> https://bugs.kde.org/attachment.cgi?id=116335&action=edit
Konsole 17.12 good shaping and rendering

SUMMARY
Konsole used to have very good support for rendering complex script languages
like Malayalam (which has conjunct glyphs and doesn't usually have a monospace
font). In Konsole 18.08, rendering is regressed. See attached screenshots from
Konsole 17.12 (good rendering) and 18.08 (bad rendering) respectively.


STEPS TO REPRODUCE
1. Open konsole
2. $echo "എളമക്കര സ്കൂളിൽ"
3. 

OBSERVED RESULT
Conjuncts (which form a single glyph from a combination of more than 2 glyphs)
are broken. Also, glyphs are chopped off (e.g. the first character എ).

EXPECTED RESULT
Glyphs are not chopped off/truncated and conjunct glyphs are formed; similar to
screenshot of konsole-17.12

SOFTWARE/OS VERSIONS
Windows: 
MacOS: 
Linux/KDE Plasma: Fedora 29
(available in About System)
KDE Plasma Version: Plasma 5.14.3
KDE Frameworks Version: Frameworks 5.52
Qt Version: 5.11.1

ADDITIONAL INFORMATION

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