i have a strange behaviour of my emacs (25.1.1) running in cygwin within a terminal window (mintty 2.7.3). Every time when doing TAB-competion (eg. M-x describe-func) I got following messages in the echo area:"user-error: Cannot decrease the default face height more than it already is". I can not debug that kind of error, because it is an user-error. All modifications, which are related to "set-face-attribute" were commented one by one and new reloaded. I already tried to set debug-ignored-erros to nil, but no success.
After a bit research: I am using icicles and i found out it has something to do with the face configuration of icicles completion menu. The hook which narrow down the selecetion appropiately to user input kicks that user-error in the echo area by pressing TAB-key. But setting all faces used in that completion menu to a high value of 110pt doesn't gave me the result.
After a bit more research: Setting in icicles icicle-show-Completions-initially-flag or icicle-incremental-completion to t for having an ido-completion feeling then the icicle command completion combined with the output of above mentioned user-error message every time you extend your input (no TAB-Key) makes icicles in that way useless. By the way the error message has changed with these settings to "icicle-execute-extended-command: Cannot decrease the default face height more than it already is", but any way it means the same.
For any hints, background information I would be very thankful. Falk