+
+## But I really want the old grumpy behaviour of my terminal
+
+Apply [1].
+
+[1] https://st.suckless.org/patches/delkey
+
+
+## Why do images not work in st using the w3m image hack?
+
+w3mimg uses a hack that draws an image on top of the terminal emulator Drawable
+window. The hack relies on the terminal to use a single buffer to draw its
+contents directly.
+
+st uses double-buffered drawing so the image is quickly replaced and may show a
+short flicker effect.
+
+Below is a patch example to change st double-buffering to a single Drawable
+buffer.
+
+diff --git a/x.c b/x.c
+--- a/x.c
++++ b/x.c
+@@ -732,10 +732,6 @@ xresize(int col, int row)
+ win.tw = col * win.cw;
+ win.th = row * win.ch;
+
+- XFreePixmap(xw.dpy, xw.buf);
+- xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
+- DefaultDepth(xw.dpy, xw.scr));
+- XftDrawChange(xw.draw, xw.buf);
+ xclear(0, 0, win.w, win.h);
+
+ /* resize to new width */
+@@ -1148,8 +1144,7 @@ xinit(int cols, int rows)
+ gcvalues.graphics_exposures = False;
+ dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
+ &gcvalues);
+- xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
+- DefaultDepth(xw.dpy, xw.scr));
++ xw.buf = xw.win;
+ XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
+ XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
+
+@@ -1632,8 +1627,6 @@ xdrawline(Line line, int x1, int y1, int x2)
+ void
+ xfinishdraw(void)
+ {
+- XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, win.w,
+- win.h, 0, 0);
+ XSetForeground(xw.dpy, dc.gc,
+ dc.col[IS_SET(MODE_REVERSE)?
+ defaultfg : defaultbg].pixel);
+
+
+## BadLength X error in Xft when trying to render emoji
+
+Xft makes st crash when rendering color emojis with the following error:
+
+"X Error of failed request: BadLength (poly request too large or internal Xlib length error)"
+ Major opcode of failed request: 139 (RENDER)
+ Minor opcode of failed request: 20 (RenderAddGlyphs)
+ Serial number of failed request: 1595
+ Current serial number in output stream: 1818"
+
+This is a known bug in Xft (not st) which happens on some platforms and
+combination of particular fonts and fontconfig settings.
+
+See also:
+https://gitlab.freedesktop.org/xorg/lib/libxft/issues/6
+https://bugs.freedesktop.org/show_bug.cgi?id=107534
+https://bugzilla.redhat.com/show_bug.cgi?id=1498269
+
+The solution is to remove color emoji fonts or disable this in the fontconfig
+XML configuration. As an ugly workaround (which may work only on newer
+fontconfig versions (FC_COLOR)), the following code can be used to mask color
+fonts:
+
+ FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
+
+Please don't bother reporting this bug to st, but notify the upstream Xft
+developers about fixing this bug.