Fix Markdown Colorization for Fenced Code Blocks When End Fence Is Prefixed by Spaces
Fix Markdown Colorization for Fenced Code Blocks When End Fence Is Prefixed by Spaces

Issue #8636

**Bug**
Fenced code block closing tags break colorization if they are prefixed with spaces. According to the commonmark spec, up to three spaces are allowed.

**Fix**
Update defintion of fenced code block closing tag to support spaces.

Closes #8636

rishii7/vscode,KattMingMing/vscode,0xmohit/vscode,the-ress/vscode,rishii7/vscode,hoovercj/vscode,microlv/vscode,Krzysztof-Cieslak/vscode,microsoft/vscode,mjbvz/vscode,landonepps/vscode,matthewshirley/vscode,microsoft/vscode,DustinCampbell/vscode,landonepps/vscode,the-ress/vscode,KattMingMing/vscode,0xmohit/vscode,Zalastax/vscode,DustinCampbell/vscode,radshit/vscode,Microsoft/vscode,hungys/vscode,cleidigh/vscode,hashhar/vscode,veeramarni/vscode,hashhar/vscode,landonepps/vscode,zyml/vscode,KattMingMing/vscode,eamodio/vscode,mjbvz/vscode,charlespierce/vscode,the-ress/vscode,charlespierce/vscode,eamodio/vscode,hashhar/vscode,Microsoft/vscode,microlv/vscode,stringham/vscode,cleidigh/vscode,eamodio/vscode,0xmohit/vscode,cleidigh/vscode,hoovercj/vscode,cleidigh/vscode,rishii7/vscode,eamodio/vscode,0xmohit/vscode,hungys/vscode,veeramarni/vscode,the-ress/vscode,hoovercj/vscode,matthewshirley/vscode,Krzysztof-Cieslak/vscode,stringham/vscode,DustinCampbell/vscode,Krzysztof-Cieslak/vscode,Krzysztof-Cieslak/vscode,hungys/vscode,mjbvz/vscode,joaomoreno/vscode,zyml/vscode,cra0zy/VSCode,hashhar/vscode,joaomoreno/vscode,veeramarni/vscode,hungys/vscode,rishii7/vscode,eamodio/vscode,Zalastax/vscode,landonepps/vscode,stringham/vscode,zyml/vscode,hashhar/vscode,hungys/vscode,joaomoreno/vscode,stringham/vscode,radshit/vscode,mjbvz/vscode,radshit/vscode,joaomoreno/vscode,Krzysztof-Cieslak/vscode,cleidigh/vscode,cleidigh/vscode,Zalastax/vscode,zyml/vscode,microsoft/vscode,cleidigh/vscode,charlespierce/vscode,joaomoreno/vscode,mjbvz/vscode,hungys/vscode,microlv/vscode,mjbvz/vscode,cleidigh/vscode,KattMingMing/vscode,joaomoreno/vscode,matthewshirley/vscode,veeramarni/vscode,Krzysztof-Cieslak/vscode,rishii7/vscode,KattMingMing/vscode,jchadwick/vscode,landonepps/vscode,landonepps/vscode,microlv/vscode,Microsoft/vscode,microsoft/vscode,eamodio/vscode,hashhar/vscode,landonepps/vscode,microsoft/vscode,veeramarni/vscode,stringham/vscode,microlv/vscode,Zalastax/vscode,hashhar/vscode,gagangupt16/vscode,KattMingMing/vscode,rishii7/vscode,hoovercj/vscode,cleidigh/vscode,stringham/vscode,the-ress/vscode,landonepps/vscode,mjbvz/vscode,gagangupt16/vscode,stringham/vscode,rishii7/vscode,Microsoft/vscode,hoovercj/vscode,KattMingMing/vscode,Microsoft/vscode,Krzysztof-Cieslak/vscode,stringham/vscode,microsoft/vscode,radshit/vscode,jchadwick/vscode,jchadwick/vscode,Zalastax/vscode,KattMingMing/vscode,veeramarni/vscode,hungys/vscode,matthewshirley/vscode,charlespierce/vscode,DustinCampbell/vscode,Zalastax/vscode,hoovercj/vscode,KattMingMing/vscode,matthewshirley/vscode,charlespierce/vscode,joaomoreno/vscode,charlespierce/vscode,joaomoreno/vscode,eamodio/vscode,the-ress/vscode,hashhar/vscode,mjbvz/vscode,Microsoft/vscode,jchadwick/vscode,the-ress/vscode,zyml/vscode,hoovercj/vscode,DustinCampbell/vscode,Krzysztof-Cieslak/vscode,0xmohit/vscode,mjbvz/vscode,Microsoft/vscode,jchadwick/vscode,stringham/vscode,KattMingMing/vscode,zyml/vscode,mjbvz/vscode,eamodio/vscode,stringham/vscode,hashhar/vscode,radshit/vscode,Zalastax/vscode,cleidigh/vscode,radshit/vscode,KattMingMing/vscode,microsoft/vscode,eamodio/vscode,matthewshirley/vscode,radshit/vscode,Zalastax/vscode,radshit/vscode,matthewshirley/vscode,radshit/vscode,Zalastax/vscode,Krzysztof-Cieslak/vscode,zyml/vscode,Microsoft/vscode,rishii7/vscode,rishii7/vscode,matthewshirley/vscode,mjbvz/vscode,matthewshirley/vscode,matthewshirley/vscode,charlespierce/vscode,DustinCampbell/vscode,zyml/vscode,mjbvz/vscode,Krzysztof-Cieslak/vscode,landonepps/vscode,Krzysztof-Cieslak/vscode,charlespierce/vscode,Zalastax/vscode,0xmohit/vscode,Microsoft/vscode,Krzysztof-Cieslak/vscode,the-ress/vscode,microsoft/vscode,microsoft/vscode,hungys/vscode,0xmohit/vscode,microlv/vscode,joaomoreno/vscode,KattMingMing/vscode,0xmohit/vscode,microsoft/vscode,veeramarni/vscode,0xmohit/vscode,zyml/vscode,mjbvz/vscode,eamodio/vscode,radshit/vscode,veeramarni/vscode,Krzysztof-Cieslak/vscode,radshit/vscode,microlv/vscode,eamodio/vscode,microsoft/vscode,landonepps/vscode,matthewshirley/vscode,hungys/vscode,mjbvz/vscode,matthewshirley/vscode,DustinCampbell/vscode,landonepps/vscode,Zalastax/vscode,matthewshirley/vscode,microsoft/vscode,veeramarni/vscode,gagangupt16/vscode,Zalastax/vscode,Krzysztof-Cieslak/vscode,DustinCampbell/vscode,radshit/vscode,veeramarni/vscode,hungys/vscode,Microsoft/vscode,hungys/vscode,stringham/vscode,gagangupt16/vscode,veeramarni/vscode,joaomoreno/vscode,jchadwick/vscode,microlv/vscode,microlv/vscode,DustinCampbell/vscode,DustinCampbell/vscode,microlv/vscode,Microsoft/vscode,landonepps/vscode,rishii7/vscode,veeramarni/vscode,joaomoreno/vscode,hashhar/vscode,DustinCampbell/vscode,stringham/vscode,zyml/vscode,hungys/vscode,DustinCampbell/vscode,zyml/vscode,mjbvz/vscode,radshit/vscode,jchadwick/vscode,0xmohit/vscode,Zalastax/vscode,hoovercj/vscode,Microsoft/vscode,eamodio/vscode,Microsoft/vscode,veeramarni/vscode,veeramarni/vscode,rishii7/vscode,jchadwick/vscode,landonepps/vscode,cleidigh/vscode,hoovercj/vscode,veeramarni/v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