Merge from origin/emacs-26

6e6bf60 Don't let delete_frame select a tooltip frame (Bug#27647)
e9dd580 Filter obtrusive events in help-read-key-sequence.
90075e8 Fix symlink flag in tramp-gvfs-handle-file-attributes
c355529 Fix bug in tramp-handle-file-truename
4c21d04 Fix a typo in doc string of electric-indent-functions-without...
319c2de Avoid assertion violations in echo_area_display
63c7733 ; * lisp/ido.el (ido-find-alternate-file): Doc fix.  (Bug#29278)
cbd319a Fix case-folding in Occur
29520b0 Fix quick-calc in C mode with hex values
3e80124 Improve documentation of dired-next/prev-marked-file
90add18 Prevent aborts in line-move-visual
648c128 More fixes in src/.gdbinit
104f3e5 Document how to enter whitespace when using grep-read-files

diff --cc lisp/dired.el
Simple merge

diff --cc lisp/electric.el
Simple merge

diff --cc lisp/net/tramp.el
Simple merge

diff --cc lisp/vc/vc-git.el
Simple merge

diff --cc src/xdisp.c
Simple merge

diff --cc test/lisp/net/tramp-tests.el
Simple merge