RSS Widget adds [...] even if the entire content is shown

[MadtownLems]

When the option to display item content is checked, the core RSS widget adds [...] regardless of if any trimming was actually done or not.

I believe [...] should only show up if something is cut off, and should not show when the entire excerpt is shown (due to its short length).

This seems related to #11244 which was marked as fixed.

[c3mdigital]

Patch checks length of string using mb_strlen. Only adds [...] if the length is > 355.

[kovshenin]

Preserve the original $desc and use $excerpt instead. Comparing the two will tell whether or not hellip should be added.

[kovshenin]

Also, if you decide to use mb_strlen, make sure the function exists first and maybe fall back to strlen.

[nacin]

Let's come to a consensus on a patch.

[SergeyBiryukov]

21702.diff​ seems good to me.

[WraithKenny]

I like 21702.diff

[SergeyBiryukov]

Related: #11446

[SergeyBiryukov]

In 24213:

Don't append ellipsis in RSS widget if the entire content is shown. props kovshenin. fixes #21702.