[Bug 31157] Filemaker Pro 12 Trial crashes when opening a sample solution ('ImmAssociateContext' should only generate 'WM_IME_SETCONTEXT' if window has focus)

https://bugs.winehq.org/show_bug.cgi?id=31157

--- Comment #16 from Maik Wagner  ---
Dear Anastasius,

thank you very much for writing this code and I am willing to give it a try to
move this forward. Please let me know what I need to do to patch the wine
sources to try this.

Here is what I know about wine development:
- I can download, compile and build Slackware packages
- I never used the patch command

Can you walk me through please or is there a tutorial in the Wiki?