Flymake: new flymake-diagnostic-format-alist (bug#77439, bug#77480)

* lisp/progmodes/flymake.el (flymake-diagnostic-text): Overhaul.
(flymake-diagnostic-format-alist): New defcustom.
(flymake--diagnostic-format): New util.
(flymake--eol-overlay-summary)
(flymake--highlight-line)
(flymake-eldoc-function): Use flymake--diagnostic-format.
(flymake--tabulated-diagnostic-origin): New helper.
(flymake--tabulated-entries-1): Use flymake--tabulated-diagnostic-origin.
(flymake--diagnostics-base-tabulated-list-format): "Backend" -> "Origin"

* doc/misc/flymake.texi (Customizable variable): Mention new variable.

1 files changed, 3 insertions, 0 deletions

diff --git a/doc/misc/flymake.texi b/doc/misc/flymake.texi
index 0e43df17aa2..dd60e0a1bca 100644
--- a/doc/misc/flymake.texi
+++ b/doc/misc/flymake.texi
@@ -351,6 +351,9 @@ distracting and easily confused with actual code, or a significant
 early aid that relieves you from moving around or reaching for the
 mouse to consult an error message.
 
+@item flymake-diagnostic-format-alist
+Control which parts of a diagnostic to show in various situations.
+
 @item flymake-error-eol
 A custom face for summarizing diagnostic error messages.