Plone 5.2: multiple js related errors

[mtrebron]

Compiling a less resource only works the first time after a theme is loaded in @@theming-controlpanel-mapper

• as soon as the compilation is completed, a new modal window appears in the top-left corner of the browser.
• after then making changes to the less file, saving and recompiling, the resulting css stylesheet does not change.

Workaround is to reload the page and select the less resource again.

[mtrebron]

Possible data-points:

1. this happens in multiple versions of firefox
2. upon loading the @@theming-controlpanelmapper, the javascript error messsges below are visible in the Firefox debug window
3. it is not possible to upload images, the preview shows as selected for upload, the upload itself fails.

TypeError: t.exec(...) is null[Learn More]  thememapper-compiled.js:41270:19
	setDefaultPaths thememapper-compiled.js:41270:19
	getManifest/<.success< thememapper-compiled.js:41213:34
	<anonymous> self-hosted:951:17
	j http://192.168.0.245:8888/Plone/++plone++static/components/jquery/dist/jquery.min.js:2:27304
	fireWith http://192.168.0.245:8888/Plone/++plone++static/components/jquery/dist/jquery.min.js:2:28122
	x http://192.168.0.245:8888/Plone/++plone++static/components/jquery/dist/jquery.min.js:5:22109
	b http://192.168.0.245:8888/Plone/++plone++static/components/jquery/dist/jquery.min.js:5:26030
TypeError: i.ace.editor is undefined[Learn More]  thememapper-compiled.js:39757:8
	openEditor thememapper-compiled.js:39757:8
	success thememapper-compiled.js:39667:12
	j http://192.168.0.245:8888/Plone/++plone++static/components/jquery/dist/jquery.min.js:2:27304
	fireWith http://192.168.0.245:8888/Plone/++plone++static/components/jquery/dist/jquery.min.js:2:28122
	x http://192.168.0.245:8888/Plone/++plone++static/components/jquery/dist/jquery.min.js:5:22109
	b http://192.168.0.245:8888/Plone/++plone++static/components/jquery/dist/jquery.min.js:5:26030