patch 8.0.0693: no terminal emulator support
Problem: No terminal emulator support. Cannot properly run commands in the
GUI. Cannot run a job interactively with an ssh connection.
Solution: Very early implementation of the :terminal command. Includes
libvterm converted to ANSI C. Many parts still missing.
diff --git a/src/libvterm/t/28state_dbl_wh.test b/src/libvterm/t/28state_dbl_wh.test
new file mode 100644
index 0000000..596194d
--- /dev/null
+++ b/src/libvterm/t/28state_dbl_wh.test
@@ -0,0 +1,61 @@
+INIT
+WANTSTATE g
+
+!Single Width, Single Height
+RESET
+PUSH "\e#5"
+PUSH "Hello"
+ putglyph 0x48 1 0,0
+ putglyph 0x65 1 0,1
+ putglyph 0x6c 1 0,2
+ putglyph 0x6c 1 0,3
+ putglyph 0x6f 1 0,4
+
+!Double Width, Single Height
+RESET
+PUSH "\e#6"
+PUSH "Hello"
+ putglyph 0x48 1 0,0 dwl
+ putglyph 0x65 1 0,1 dwl
+ putglyph 0x6c 1 0,2 dwl
+ putglyph 0x6c 1 0,3 dwl
+ putglyph 0x6f 1 0,4 dwl
+ ?cursor = 0,5
+PUSH "\e[40GAB"
+ putglyph 0x41 1 0,39 dwl
+ putglyph 0x42 1 1,0
+ ?cursor = 1,1
+
+!Double Height
+RESET
+PUSH "\e#3"
+PUSH "Hello"
+ putglyph 0x48 1 0,0 dwl dhl-top
+ putglyph 0x65 1 0,1 dwl dhl-top
+ putglyph 0x6c 1 0,2 dwl dhl-top
+ putglyph 0x6c 1 0,3 dwl dhl-top
+ putglyph 0x6f 1 0,4 dwl dhl-top
+ ?cursor = 0,5
+PUSH "\r\n\e#4"
+PUSH "Hello"
+ putglyph 0x48 1 1,0 dwl dhl-bottom
+ putglyph 0x65 1 1,1 dwl dhl-bottom
+ putglyph 0x6c 1 1,2 dwl dhl-bottom
+ putglyph 0x6c 1 1,3 dwl dhl-bottom
+ putglyph 0x6f 1 1,4 dwl dhl-bottom
+ ?cursor = 1,5
+
+!Double Width scrolling
+RESET
+PUSH "\e[20H\e#6ABC"
+ putglyph 0x41 1 19,0 dwl
+ putglyph 0x42 1 19,1 dwl
+ putglyph 0x43 1 19,2 dwl
+PUSH "\e[25H\n"
+PUSH "\e[19;4HDE"
+ putglyph 0x44 1 18,3 dwl
+ putglyph 0x45 1 18,4 dwl
+PUSH "\e[H\eM"
+PUSH "\e[20;6HFG"
+ putglyph 0x46 1 19,5 dwl
+ putglyph 0x47 1 19,6 dwl