It would be really necessary to be able to add a filter to the symbol list when there are many symbol in a file.
It can achieve the feature similar to: 1. Sublime Text's Goto Symbol 2. JetBrains IDE's Goto Symbol
Best regards
The filter box at the top of the symbols tab WFM on current git Geany.
 That's cool, nice job, it solves my pain point, thanks.
I test it and found a issue: 1."Filter the symbol list using the entered text", it works. 2."Separate multiple filters with a space", but it dont's works. 
"Separate multiple filters with a space", but it doesn't work.
The multiple filters are `and`ed not `or`ed, for example with `document.c` in Geany source, a filter of "doc find sea" finds only `document_search_bar_find()`
Closed #3298 as not planned.
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