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);