When filetype is changed to a compatible filetype (such as C->C++ and then possibly back to C), colorization is lost. It seems that with Scintilla 5, when language-specific highlighting changes, SCI_SETKEYWORDS has to be called again to take effect.
By setting keyword_hash to 0 we force Geany to call sci_set_keywords() in document_highlight_tags() which fixes the problem.
Fixes #3550 You can view, comment on, or merge this pull request online at:
https://github.com/geany/geany/pull/3553
-- Commit Summary --
* Fix keyword colorization on filetype change
-- File Changes --
M src/document.c (3)
-- Patch Links --
https://github.com/geany/geany/pull/3553.patch https://github.com/geany/geany/pull/3553.diff