[rkward] [Bug 405386] RKWard Version 0.7.0z+0.7.1+devel1 can't preview Markdown

[Adley]

https://bugs.kde.org/show_bug.cgi?id=405386

--- Comment #7 from Adley <adleyvong at gmail.com> ---
Created attachment 118778
  --> https://bugs.kde.org/attachment.cgi?id=118778&action=edit
rk.sessionInfo()

For question number 2: 
    rk.show.html(), Preview->R Markdown and Preview->R Console are the same; 
    They can't work properly to the "output.html", but Preview->R Console 
    shows a message: 
        Warnings or Errors: 
           Error in attr(exprs, "srcref")[[i]] : subscript out of bounds
    I think it means the attr "xmlns".

Yes, you right. I think it might be related to my installation steps, since it
works in kdevelop without removing the "xmlns".

My installation steps as below:
Fist, I list all the dependencies I installed.
kf5-kdewebkit-devel.x86_64    kf5-ktexteditor-devel.x86_64 
kf5-kdoctools-devel.x86_64 R-devel.x86_64 extra-cmake-modules.noarch 
qt5-qtscript-devel.x86_64 kf5-knotifications-devel.x86_64
kf5-kxmlgui-devel.x86_64 kf5-kwidgetsaddons-devel.x86_64
kf5-kdbusaddons-devel.x86_64 kf5-kconfigwidgets-devel.x86_64
kf5-ki18n-devel.x86_64 kf5-kwindowsystem-devel.x86_64 kf5-kcrash-devel.x86_64

get the snapshot from github kde mirror
1. mkdir build; cd build 
2. cmake /home/user/rkward-master/
-DR_LIBDIR='/home/user/R/x86_64-redhat-linux-gnu-library/3.5'
3. make
4. make install

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