Document a problem with Microsoft SwiftKey

* etc/PROBLEMS (Runtime problems specific to Android): Document
incompatibility with Microsoft Swiftkey.

(cherry picked from commit dc5390d06a65f4d481b8bb20da4f6715c2079ea6)

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index 27761dddf040adeffa046f49040e7499ec0d8e99..2922f5a384c86c0a17bc25c9e3eb1794466e1234 100644 (file)
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -3623,6 +3623,17 @@ The organization of the Settings app might disagree with that
 illustrated above, which if true you should consult the documentation
 or any search mechanism for it.
 
+** Emacs is not compatible with the "Microsoft SwiftKey" input method.
+
+When enabled, windows are repeatedly recentered around earlier buffer
+positions as they are scrolled.  The underlying cause is that Microsoft
+SwiftKey aggressively forces point towards word boundaries, which motion
+is sometimes received and duly processed by Emacs after the window in
+question has already been scrolled past its target position, with the
+result that the next redisplay recenters the window around this outdated
+position.  There is no solution but installing a more
+cooperative--and preferably free--input method.
+
 * Build-time problems
 
 ** Configuration