Invalid background color triggers js error in IE and erratic behavior in others

[Dinu]

To reproduce:

• insert table
  
• cell properties
  
• in background field, enter invalid color "foo"
  
• click ok
  

Results:

• in IE: "Invalid property value" error, ok button is rendered useless; an anecdotic form submission happened but can't reproduce
  
• in FF and others: value seems to be ignored (I think this is wrong, invalid value should be used regardless as long as it doesn't break CSS), however element's style does get rewritten and dirty flag gets set
  

Expected behavior (I presume):

• Either update the invalid value regardless (don't try to parse to rgb(...))
  
• Or, provide a remark to the user and don't close the dialog and don't update any document contents
  

Secondary:

• A valid value without "#" is invalid just the same: "111111"; for convenience, a # should be implied when it can be hex-parsed ("111","111111")
  

[Dinu]

Update: having a space anywhere in the color breaks format; a trim should be used to clear before and after space. Test: " #111111", "#111111 "

[Jakub Ś]

#10647 was marked as duplicate