Merge from origin/emacs-25

697167b ; Improve wording of previous change in variables.texi
d7973e8 Document 'default-toplevel-value' and 'set-default-toplevel-v...
8b71826 Don't modify minibuffer variables globally
5b5e036 Revert to pre-25.1 behavior in ffap
19994a1 * lisp/ffap.el: Fix obsolete comment referencing ffap-bug.
3ace730 Attempt to fix 64-bit AIX build
f69bd79 Clarify usage of 'ediff-cleanup-hook' (Bug#24675)
c04ac8a Document that variable binding order is unspecified
272554a * lisp/desktop.el (desktop-buffers-not-to-save): Doc fix.
08de101 Fix M-x hints on Mac port
86a297a Work around reporting a dpi change in apply_xft_settings
cf1f985 ; lisp/skeleton.el (skeleton-insert): Fix typo in last change
9e1209d Amend the version number of CC Mode 5.33 -> 5.32.99.  Don't m...
88cdf14 Improve skeleton docstrings

2 files changed, 22 insertions, 7 deletions

diff --git a/src/unexaix.c b/src/unexaix.c
index c2012f77cac..5685aee5480 100644
--- a/src/unexaix.c
+++ b/src/unexaix.c
@@ -245,15 +245,15 @@ make_hdr (int new, int a_out,
 
       if (f_thdr == 0)
 	{
-	  ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT);
+	  ERROR1 ("unexec: couldn't find \"%s\" section", _TEXT);
 	}
       if (f_dhdr == 0)
 	{
-	  ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA);
+	  ERROR1 ("unexec: couldn't find \"%s\" section", _DATA);
 	}
       if (f_bhdr == 0)
 	{
-	  ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS);
+	  ERROR1 ("unexec: couldn't find \"%s\" section", _BSS);
 	}
     }
   else
@@ -382,7 +382,7 @@ copy_text_and_data (int new)
   write_segment (new, ptr, end);
 
   lseek (new, data_scnptr, SEEK_SET);
-  ptr = (char *) f_ohdr.data_start;
+  ptr = (char *) (ptrdiff_t) f_ohdr.data_start;
   end = ptr + f_ohdr.dsize;
   write_segment (new, ptr, end);
 
@@ -399,7 +399,7 @@ write_segment (int new, char *ptr, char *end)
   for (i = 0; ptr < end;)
     {
       /* distance to next block.  */
-      nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr;
+      nwrite = (((ptrdiff_t) ptr + UnexBlockSz) & -UnexBlockSz) - (ptrdiff_t) ptr;
       /* But not beyond specified end.  */
       if (nwrite > end - ptr) nwrite = end - ptr;
       ret = write (new, ptr, nwrite);
diff --git a/src/xsettings.c b/src/xsettings.c
index d7af68f1c5f..10afd7d15c8 100644
--- a/src/xsettings.c
+++ b/src/xsettings.c
@@ -667,8 +667,23 @@ apply_xft_settings (struct x_display_info *dpyinfo,
     }
 #endif
 
-  if ((settings->seen & SEEN_DPI) != 0 && oldsettings.dpi != settings->dpi
-      && settings->dpi > 0)
+  if ((settings->seen & SEEN_DPI) != 0
+      && settings->dpi > 0
+      /* The following conjunct avoids setting `changed' to true when
+	 old and new dpi settings do not differ "substantially".
+	 Otherwise, the dynamic-setting Elisp code may process all sorts
+	 of unrelated settings that override users' font customizations,
+	 among others.  Compare:
+
+	 http://lists.gnu.org/archive/html/emacs-devel/2016-05/msg00557.html
+	 http://lists.gnu.org/archive/html/bug-gnu-emacs/2016-12/msg00820.html
+
+	 As soon as the dynamic-settings code has been tested and
+	 verified, this Emacs 25.2 workaround should be removed.  */
+      && ((oldsettings.dpi >= settings->dpi
+	   && (oldsettings.dpi - settings->dpi) > 2)
+	  || ((settings->dpi > oldsettings.dpi)
+	      && (settings->dpi - oldsettings.dpi) > 2)))
     {
       FcPatternDel (pat, FC_DPI);
       FcPatternAddDouble (pat, FC_DPI, settings->dpi);