dojox.gfx.utils.toSvg creates broken svg files when a text shape contains "="

[redstone]

The dojox.gfx.utils.toSvg function creates invalid svg format data if an input surface contains the text shape with "=" as its inner string.

e.g. for the text shape like createText({text:"a=b"}), the output svg would be <svg><text>a="b</text"></svg>

This seems due to the string replacement in the function dojox.gfx.utils._cleanSvg. In the function _cleanSvg, the regex replacement, svg.replace(/[=]([^{"']+?)(\s|>)/g,'="$1"$2') in the source code, must take place only in svg tags while the above example is not.}

I currently avoid the unexpected replacement by quoting the inner string, like createText({text:"'a=b'"}).

thanks.

[Patrick Ruzand]

Duplicate of #15818.