Unsolved How to make pepper plugins in Qt5.9 supported, in addition to "setAttribute (QWebEngineSettings: : PluginsEnabled, true)".
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I compiled the Qt5.9 source code (including QWebEngine module) :
Qt WebEngine:
Embedded build...no
Pepper Plugins...yes
Printing and PDF...yes
Proprietary Codecs...yes
Spellchecker...yes
WebRTC...yes
Using system ninja...yes
But in the end, you won't be able to display pepper plugins in QWebEngineView, even if I set up "setAttribute (QWebEngineSettings: : PluginsEnabled, true)".