mu4e: add mu4e-view-mime-parts

Add a special mode for setting the gnus parameters to have images shown
/ buttonized so they can be saved etc.

Fixes #2516.

2 files changed, 16 insertions, 5 deletions

diff --git a/mu4e/mu4e-view.el b/mu4e/mu4e-view.el
index 075c558..4f719d3 100644
--- a/mu4e/mu4e-view.el
+++ b/mu4e/mu4e-view.el
@@ -754,12 +754,19 @@ determine which browser function to use."
     (mu4e-view-quit)
     (mu4e-view msg)))
 
-(defun mu4e-view-toggle-show-mime-parts()
-  "Toggle whether to show all MIME-parts."
+(defun mu4e-view-show-mime-parts()
+  "Show all MIME-parts.
+
+This can be useful for messages with embedded images etc. that
+you want to save, and that are not accessible otherwise. However,
+note that Emacs can get slow with big attached images.
+
+To go back to normal display, quit the message and re-open."
   (interactive)
-  (setq gnus-inhibit-mime-unbuttonizing
-        (not gnus-inhibit-mime-unbuttonizing))
-  (mu4e-view-refresh))
+  (let* ((toggle (not gnus-mime-display-multipart-as-mixed))
+         (gnus-inhibit-mime-unbuttonizing (not toggle))
+         (gnus-mime-display-multipart-as-mixed toggle))
+    (mu4e-view-refresh)))
 
 (defun mu4e-view-toggle-fill-flowed()
   "Toggle flowed-message text filling."
diff --git a/mu4e/mu4e.texi b/mu4e/mu4e.texi
index d39eadd..2466a32 100644
--- a/mu4e/mu4e.texi
+++ b/mu4e/mu4e.texi
@@ -1506,6 +1506,10 @@ if you have Gnus-specific settings for @t{gnus-blocked-images}, you
 should verify that they have the desired effect in @code{mu4e} as
 well.
 
+Finally, for some message with big images it can be useful to enable buttons and
+full display, e.g. for saving inline images. For this you can try @code{M-x
+mu4e-view-show-mime-parts}. This can be a little slow.
+
 @node MSGV Attachments and MIME-parts
 @section Attachments and MIME-parts
 @cindex attachments