1 files changed, 15 insertions, 11 deletions
diff --git a/lisp/progmodes/flymake.el b/lisp/progmodes/flymake.el
index 19dac81fe6d..0d200f01b34 100644
--- a/lisp/progmodes/flymake.el
+++ b/lisp/progmodes/flymake.el
@@ -342,7 +342,7 @@ region is invalid."
                 (let* ((beg (fallback-bol))
                        (end (fallback-eol beg)))
                   (cons beg end)))))))
-    (error (flymake-error "Invalid region line=%s col=%s" line col))))
+    (error (flymake-log :warning "Invalid region line=%s col=%s" line col))))
 
 (defvar flymake-diagnostic-functions nil
   "Special hook of Flymake backends that check a buffer.
@@ -522,11 +522,12 @@ associated `flymake-category' return DEFAULT."
         (flymake--fringe-overlay-spec
          (overlay-get ov 'bitmap)))
       (default-maybe 'help-echo
-        (lambda (_window _ov pos)
-          (mapconcat
-           #'flymake--diag-text
-           (flymake-diagnostics pos)
-           "\n")))
+        (lambda (window _ov pos)
+          (with-selected-window window
+            (mapconcat
+             #'flymake--diag-text
+             (flymake-diagnostics pos)
+             "\n"))))
       (default-maybe 'severity (warning-numeric-level :error))
       (default-maybe 'priority (+ 100 (overlay-get ov 'severity))))
     ;; Some properties can't be overridden.
@@ -603,8 +604,8 @@ not expected."
           (null expected-token))
         ;; should never happen
         (flymake-error "Unexpected report from stopped backend %s" backend))
-       ((and (not (eq expected-token token))
-             (not force))
+       ((not (or (eq expected-token token)
+                 force))
         (flymake-error "Obsolete report from backend %s with explanation %s"
                        backend explanation))
        ((eq :panic report-action)
@@ -744,8 +745,11 @@ Interactively, with a prefix arg, FORCE is t."
           ()
           (remove-hook 'post-command-hook #'start-post-command
                        nil)
-          (with-current-buffer buffer
-            (flymake-start (remove 'post-command deferred) force)))
+          ;; The buffer may have disappeared already, e.g. because of
+          ;; code like `(with-temp-buffer (python-mode) ...)'.
+          (when (buffer-live-p buffer)
+            (with-current-buffer buffer
+              (flymake-start (remove 'post-command deferred) force))))
          (start-on-display
           ()
           (remove-hook 'window-configuration-change-hook #'start-on-display
@@ -948,7 +952,7 @@ applied."
              (message
               "%s"
               (funcall (overlay-get target 'help-echo)
-                       nil nil (point)))))
+                       (selected-window) target (point)))))
           (interactive
            (user-error "No more Flymake errors%s"
                        (if filter