Ctrl+F crashed only when built with '--disable-deprecated'.
If configure from normal way, there was no crash anymore:
./configure --program-suffix=131 --prefix=$PWD/0exe
I did not try your suggested debug ways due to limited spare time, sorry.
System info: Debian 9, xfce4 4.12, configure log (same for with --disable-deprecated or not):

Install Geany in                 : /home/aa/tools/src/geany-1.31/0exe
Using GTK version                : 2.24.31
Enable binary relocation         : no
Build with plugin support        : yes
Use (UNIX domain) socket support : yes
Use virtual terminal support     : yes
Build HTML documentation         : no
Build PDF documentation          : no
Build API documentation          : no
Generate GtkDoc header           : yes

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